Lunacy

I had an Edgars Card which they changed to blue Bean, I already had a Bluebean this went on for years. then in August they took the 2 Bluebean Cards and gave me I Gold Card so I only have use of the one Gold bean card. but they keep sending me two statements I pay these statments ON TIME but these people put the payments on the wrong cards etc, every month they threaten to give me a bad credit rating besides charging me extra late fees and interest. I said as I'm only using one card why cant they put the two statements together and as I'm using only one card I should only have one statement but this does not make sense to these people and so it goes on every month later fees and threatening calls I even send a copy of the payment they state is outstanding can anyone suggest what I can do to make sense of this whole isssue to me 1 card 1 statement. this seemingly does not make sense to Standard Bank