Credit One Bank I make Payments: they accept it but will not post as paid. Las Vegas Nevada

I need help. I applied for a credt card. I activated credit card July 16. 2015.  July 18th got a pill to pay $81.96. I have never used card. This was for CreditCard  and one year menbership. That is not the problem. I set a payment plan from my own Citibank account. SO I made the full payment. Citibank paid Credit One Bank on July 21st.  But $84.96 was taken from my checking account. On  July 21th, Credit One Bank asked for some data, I did it. Was asked for a $25 payment. So I paid . Wen I talked to customer service about the bill I was given the run around and told it was my problem My Bank paid both bills to credit one. They claimed only the $25 payment not the $84.96. This upset me because they do want to solve the Problem. But thay want another payment  on 8/7/15. That is over payment on the real Bll of $84.96.  I have call some 7 times ad get no answer. They say it is all my fault. They take the money but wish not  to credit my account. Is that legal????I need your help and advise.  I just want Credit One Bank to fix it. I pay what I owe  but do want toget credit for the payment. I am working with Citibank also. Can you help me? Tank you.  Rene, Van Nuys, Calif.