Product: Debt collection

The debt originated from XXXX at XXXX XXXX for repairs. The balance was sent directly to Sentry Recovery. Sentry Recovery contacted us via telephone to notify us that there was a debt. We made an appointment to arrange payments in which we brought in a {$300.00} payment on XXXX/XXXX/15 ; On this day we signed what we now know as Judgment documents but were told we could n't sign the same document because we were n't married we were not given the option to not sign because they would n't accept a payment unless we did sign. Our payments were set for the XXXX and XXXX of each month of {$50.00} each payment to apply to XXXX mine XXXX XXXX XXXX & XXXX XXXX XXXX. The first payment of {$50.00} was made on XXXX 2015. 
XXXX XXXX of {$50.00}, XXXX payment : XXXX/XXXX/2015 of {$50.00}, on the XXXX payment I called on XXXX/XXXX/15 and asked if I could drop the payment in drop box when I got off of work, I was told " No it went into default this morning you would have to make an appointment to sign another contract and pay {$400.00} for attorneys fees to restart payments. '' I disagreed with their refusal of my payment whether it was hours late or not they should not be allowed to decline a payment. So on XXXX/XXXX/15 we went to the original creditor aka XXXX to pay them off the remaining balance of {$570.00}, they accepted payment and stamped and signed our last receipt from Sentry with a paid in full the also called Sentry to let them know the debt was settled. On XXXX/XXXX/15 Sentry filed the documents known to us originally as payment arrangements contract only to find out they were judgment documents. On XXXX/XXXX/15 Sentry called me at work to tell me that they received a call from XXXX stating that the debt was settled on their end but that we still owed Sentry for Attorney fees and court cost of {$470.00}. I again disagreed since the debt was settled before they even went to file judgment. I then went down on to the office on XXXX/XXXX/15 to pay the so called remaining balance to just be done with it I received a paid in full for the remaining balance which included interest of {$590.00}. Then yesterday ( XXXX/XXXX/15 ) we went to XXXX 's former job XXXX XXXX to shop and his former manager said that law enforcement was there this morning looking for XXXX and left a document for wage garnishment. So we went back to Sentry to find out why this harassment was still going on for a debt that had been paid for almost a month now. The lady who we were supposed to talk to was not in the office so we returned this morning to the office to speak to her and she 's claiming that XXXX 's debt still exist for attorneys fees and court cost. We asked why and she says that we signed separate judgments therefore they are separate accounts. 
1.Why is there now XXXX separate accounts when we were told it did n't mattered who paid as long as the debt was paid? 
2.How can they even charge for attorney fees and court cost for an account when the debt was settled with the creditor before the date that the judgment was filed? 
3. Why if I still hold a paid in full receipt from not only the creditor but also the collection agency are we still being harassed for money?