Frustrated customer

Never have I been so upset about a company who over charge me. Edgars been sending me a invoice with interest charges on my account. Ive been contacting them numerous times about my account I don't get from them, just to findout that I've payed my dads account and not mine which I phoned them about. The credit was still not allocated on my account up until today. I was charged sms charges and calls which i never got from them. This is really ridiculous, Edgars is not the same since RCS took over. I never receive my account via sms or mail and they even took of the statement view from the website where I could also view my *** WHICH IS STILL NOT SHOWING ON MY ACCOUNT THIS IS SO ****ING UPSETTING WHAT'S THE ****EN USE OF MY CALLS TO YOU.......