Back in 2013, we were billed by XXXX for usage that we were n't responsible for. Due to us switching carriers, there were some discrepancies with billing where there was an overlap of carrier usage, thus causing XXXX to perceive that we still owed them usage charges. After receiving numerous billing statements from XXXX ( even after trying to resolve this issue over the phone, another company ( hired by XXXX ) contacted us for payment. A letter was sent to clarify the situation and further communication resumed between us and XXXX, and the charges were adjusted and the balance paid. We are now getting phone calls ( multiple daily phone calls ) from a supposed debt collection agency to pay money owed to XXXX. After telling us the amount owed, they ask for information needed to pay this debt. I did not provide that information and told them I would contact them as soon as had information confirming that I no longer owed anything to XXXX.