My experience was terrable, I bought a phone on contract last month hoping for the best given that I've been their loyal client over the past 10+ years using this network but never bought a phone on contract

My experience was terrable, I bought a phone on contract last month hoping for the best given that I've been their loyal client over the past 10+ years using this network but never bought a phone on contract. To my suprised I was over charged more what was sold to me R2300 instead of R629 I signed for was debit on my account without my knowledge. When wen back to the Rosebank branch where the phone was sold the promised they've fixed the matter "it was a mistake" but the invoice came back with more to be paid again matter gotten worse they even suspended my number claiming I'm owing them usage limit I never asked and agreed upon. I feel that my consumer rights are violated here in justice this ***** I don't have access to calls nor SMSs because I'm being forced to pay what I didn't sign for or never told about.