Product: Credit card

First off, I have excellent credit and I pay all of my bills on time. If I owe it, I pay it and I pay it on-time. With that being said, here 's my story : I opened a corporate XXXX XXXX account with a previous employer in early XXXX for XXXX associates ( myself and XXXX other ) to use for business expenses. I left that company in XXXX and agreed to leave the account open for 1 month while automatic billings were changed. I made sure all of the open balances were paid on both cards before I left. The company 's physical address was the billing address for the corporate cards. In XXXX XXXX I rec 'd a call from a company, GC Services informing me that my XXXX XXXX XXXX card had been sent to collections and I owed them {$400.00}. I had no idea what they were talking about and after about 5 minutes of going back and forth figured out that they were referring to the XXXX Corporate account from my previous employer. I asked for a copy of the statement, the date of the transaction, or anything else they could give me an idea about what had happened. This associate did n't have anything for me, not even the original charge amount. The only thing they knew was that it was an XXXX Corporate account that was linked to my social security number. In fact, GC Services did n't even have my home billing address. I explained that I was no longer employed at that company and would n't be able to help them without some additional information. I called XXXX direct and was able to determine that the charge was from XXXX XXXX ( 4 months after I left the company ). I did not know of the charge, did not approve the charge and was n't informed by anyone when the charge was billed. I was never contacted by XXXX XXXX about this charge. This is obviously a fraudulent charge. I conveyed this to the contact at GC Services, he reluctantly agreed, and he closed the case. As far as I knew, now I seem to be on a 5 month schedule of a new contact at GC Services calling me and asking for the same {$400.00} ( XXXX, XXXX, XXXX and now XXXX ). In XXXX GC Services did provide the statement with the charge and again I confirmed that it was not my charge, that I had no knowledge of the charge and that it was the first time I had actually seen the statement that contained the fraudulent charge. I even gave them written confirmation that it was fraudulent. Now, GC Services XXXX XXXX XXXX XXXX ext XXXX ) has started the process again. I told him the same story. He said that XXXX XXXX had looked at my claim and denied to accept it as fraudulent. When I call XXXX XXXX ( I still have other XXXX XXXX accounts - not for long ), they have no idea who GC Services is speaking with at XXXX XXXX nor do they seem to have any interest or way to contact them. The only thing they seem to able to do to is give me GC Services customer service number which again leads back to the same person that called me to collect the same {$400.00} ( original charge was {$190.00} XXXX. I 'm locked in a never ending cycle of GC Services claiming that XXXX XXXX has denied the claim and XXXX XXXX claiming that they do n't know who GC Services is talking to. It is beyond frustrating and at this point feels more like harassment than anything else. I 'm not sure how a fraudulent charge is better defined as fraudulent than mine ( no possession of the card, no knowledge of the charge, and no contact about the bill ). I want GC Services to stop contacting me and I want XXXX XXXX to acknowledge this charge as fraudulent and process it the same way they would any other fraudulent charge ( over the past 10 years, I 've had XXXX other cases of fraudulent charges that were dealt with properly ). HELP!