MBD not responding to request

I paid my account in 2019. I recently discovered that im still listed as owing money. I contacted MBD to request my paid up letter so i can forward this as my proof. The customer care centre is giving all these different phone no... not one is being anwered or some just straight to voice mail. I have emailed and still no response. Strange how they can hound you, but yet give you the run around when you need documentation, due to them not recording it as paid in the first place.... Attorneys hey???? never had any proper dealings with them..