Pathetic service from Discovery Band

My current wife gets phone calls from discovery bank 2 to 3 times a day asking us for payment. this account was opened with my previous wife about 20 years ago. this account has been paid, we asked for a statement in November 2020, which my ex-wife paid, she sent confirmation to me and I sent it to Discovery Bank, Larry Williamson, who heads one of the collections departments, told me he sees the account has been paid but cant find it???? (what ever that means) he has spoken to my ex-wife, who has sent him everything that she has the power to get. but nothing has happened. the bank still has some company calling us everyday about this account, when I try to contact Larry, we spent hours on the phone going from one person to the next, eventually the phone call is cut off, I'm trying to have this sorted out so we do not have people wasting our time while at work asking us for money that we have already paid. No joy from Discovery Bank would not recommend them to anyone.