RCS with annoying payment calls

I pay my RCS card on time ALWAYS!!!. I always pay more than the required minimum payment but, I get calls non stop reminding me of a payment I made 5 days ago, they go to an extent of calling my workplace looking for me. RCS what is this? I really don’t appreciate what you doing. You are lowering my self esteem, I am looking forward to closing the account and never looking back again. I won’t even advise my people to have one.