Product: Debt collection

XX/XX/XXXX I was served a summons from XXXX XXXX, XXXX. The demanded amount was {$7.00}, XXXX. 
XXXX file # XXXX On XX/XX/XXXX I called the number on the summons which is XXXX XXXX XXXX located The XXXX XXXX XXXX XXXX XXXX XXXX, XXXX XXXX XXXX, CA XXXX. Phone number XXXX I spoke to XXXX XXXX extension # XXXX I asked questions about my summons and came to agreement on a settlement balance of {$5000.00}. XXXXXXXX XXXX XXXX proceeded to send me a stipulation agreement for the first year to pay {$25.00} a month and then the following year {$75.00} a month. I have been making payments ever since XX/XX/XXXX to present and never have been late. The payoff date stated in the stipulation agreement is on or before XX/XX/XXXX XXXX 
From XX/XX/XXXX to XX/XX/XXXX I have made payments in a total of {$2600.00} and the amount left owed is {$2300.00} from the stipulated settlement agreement of {$5000.00}. 
On XX/XX/XXXX I received a letter from Gurstel law firm pc located XXXX XXXX XXXXXXXX XXXX, XXXX XXXX, MN XXXX. The letter stating I owe a debt in the amount of {$4.00}, XXXX with a reference number of XXXX I was confused and had no idea who the collector or debt was. I sent back a letter for verification of the debt. The letter was sent certified on XX/XX/XXXX I also emailed Gurstel Law firm to verify the debt. 
On XX/XX/XXXX I received a letter from Gurstel Law firm. Letter stated original creditor which is XXXX and XXXX XXXX XXXX XXXX XXXX  XX/XX/XXXX I called XXXX XXXX XXXX, the original debt collector I was paying that I had a stipulated agreement of a settlement balance of {$5000.00} to ask them what is going on with my account. Why I never received a payment statement from XX/XX/XXXX and XX/XX/XXXX. Also to let them know Gurstel Law Firm was trying to collect from me on the same account. The debt collector I spoke to, XXXX XXXX. I spoke to XXXX XXXX XXXX XXXXXXXX XXXX XXXX XXXX  around XXXXXXXX XXXX  She said that XXXX XXXX XXXX  no longer has my account that Gurstel had it and to call the number on the statement. I called Gurstel Law firm the same day XX/XX/XXXX. The operator that answered was XXXX XXXX. XXXX XXXX explained to me that Gurstel bought out XXXX XXXX XXXX. I was very confused on why I was never notified of the change and received a new debt collection letter with a higher amount than I owed. XXXX XXXX XXXX never notified me of this change and has broken the stipulation agreement. XXXX XXXX XXXX and Gurstel law group has falsely claimed the wrong balance on the total amount owed of the stipulated account settlement of {$5000.00}. I have copies of all payments made from XX/XX/XXXX to XXXX XXXX XXXX XXXX XXXX XXXX that they no longer Have my account and it was given back to XXXX XXXX XXXX XXXX. XXXXXXXX XXXX XXXX and Gurstel Law group are both pending license application, and could not provide me with a license number when I sent the letter of verification of debt. They have failed to provide me with accurate information on my account balance. XXXX XXXX XXXX and Gurstel law group failed to inform me of them breaking the stipulated agreement and change of collection. Both also trying to collect more money than I owed.