I already paid this debit prior with another credit agency, But now the debt has changed names and been sent to someone else to deal with even though it was already paid. I sent letter by certified mail to collector back on XXXX/XXXX/2015 asking for validation of proof that I owe debt from previous credit agency which was signed and received on their end on XXXX/XXXX/2015 and informed them of the FDCPA and that they are given 30 days to get this information out to me or else they would need to stop any debt collection from me. Now we sit at XXXX/XXXX/2015 and no information as of yet. I contact the collector and was informed that on XXXX/XXXX/2015 they mailed out information claiming validation of my debt and that the process took longer than 30 days to collect and that I should receive it in the mail in a few days. In the meantime the collector is filing default on me regarding this debt stating that I owe it which I do not and with that certified letter I sent was all the proof they needed to see that it has been paid for but regardless they want to still pursue to collect. They have violated the FDCPA.