I.C. System, Inc. Debt Collection Complaint

I.C. System, Inc. Debt collection department,

Medical Cont'd attempts collect debt not owed Debt was paid New Jersey

I paid a dept in full and was told that I would receive a written confirmation that the payment was made. After not receiving the confirmation, I have contacted the collection agency numerous times ; they promise to send the confirmation but never do so. Without it, I am fearful that this debt may remain on my credit report. I am also waiting for a loan to be approved from a - - and they will not process the loan until they receive a copy of the written confirmation. I have no confidence that the collection agency will provide me with this document unless they are compelled to do so.