Product: Debt collection

On XX/XX/18 I brought my car into XXXX, XXXX XXXX XXXX XXXX, NY for an inspection. It passed inspection. The mechanic noticed the ABS ( automatic brake system ) light was on. I told him a previous mechanic told me it would cost {$600.00} but it wasn't actually necessary to have and since it was a lot of money I opted not to have ti done. Many older cars come without ABS. XXXX the manager and the mechanic told me it would only cost {$71.00} for the part and {$45.00} for labor so of course I was elated and I agreed. I waited for 4 hours. They told me I would have to bring the car back and leave it for a day since it had to be sent out to their shop. The part would not fit without compressing another part. I paid {$360.00} that day. I brought the car back on XX/XX/18 and left it. After 9 hours I called and was told I could pick the car up but I shouldn't be concerned that the ABS light was still on since the " computer has to communicate with the new part '' and this wouldn't happen until I put 50 miles on the car. I was shocked to be presented with another bill {$360.00}. I went on a trip and put 535 miles on the car. Light still on. In addition the car had a noise it never had before and the steering felt off.I called XXXX on XX/XX/18 and told him I wanted this problem fixed or I wanted a refund.He told me his boss was out sick but would call me Monday, XX/XX/18. No call back. I called the next day XX/XX/18 and spoke to boss XXXX. He apologized and told me to come in on XX/XX/18 and he would issue me a refund. He told me the refund may take a few days to go through and that he would call me that Monday XX/XX/18. This was on a Thursday XX/XX/18. It made sense and I had no reason to not believe him. No call on Monday. I called Synchrony Bank which is actually XXXX and saw refund not reflected. XX/XX/18 I called XXXX again and was told XXXX would be calling me the next day at XXXX XXXX. No call from XXXX. On XX/XX/18 I called Synchrony to dispute charges since I am now getting billed. I faxed a formal complaint to XXXX Corporate Office on XX/XX/18. On XX/XX/18 I received a letter from Synchrony stating that they found in favor of the merchant and this matter was closed. The letter had a copy of the invoice which was partially whited out. When I compared it to my original invoice I saw it was filled with inaccuracies. They used the XX/XX/XXXX invoice rather than the invoice of XX/XX/XXXX which I am disputing. They have actually altered this invoice. They have whited out dates, invoice number and more.. I called the Corporate office and was told some would be getting back to me " as soon as possible ''. As of this date the ABS light is still on, I am still being billed and I am being totally ignored by not only this merchant but also by Corporate. I was scammed into getting their credit card. On my first visit I was offered a credit card and said " no thank you ''. XXXX asked me for my SS number and said he needed it for the computer. When I gave him my debit card to pay he said " oh no, you're already approved. Its on the card ''. XXXX   the manager is very friendly and told me he wanted to be a priest. XXXX told me he is an ex police officer. I trusted them completely. They have ignored my calls and the Bank is, in essence, XXXX so they are ignoring me. So it ended up costing me {$730.00} for a simple inspection. They are unscrupulous. After having my car a total of 13 hours, using a quarter tank of gas, causing a noise I never had before and screwing up the steering and still not fixing the ABS problem they want me to actually pay and additional {$360.00}. I am at my wits end with XXXX/Synchrony. I will have no choice but to pay this bill or harm my credit rating. Please whatever help you can give me would be very much appreciated.