RMCS CHARGE ME R782 118.79 FOR A PHONE BILL WHILE THE PHONE IS ACTUALY ON PRE-PAID AND RE-LOADED WITD PRE-PAID AIRTIME ON A DAILY BASIC!!!

When I bought my Samsung phone, I bought a prepaid vodacome simcard and let it be rica as well. It all happend a year ago. Every time when i need airtime or data i buy it from my capitec account direct to my phone. Till date i bought R20 732.00 on airtime and data. Tonight i phoned 111 to fined out frpm vodacom how international roaming works because i'm going to Namibia for work when a computer voice told me i have a contract with RMCS (retail mobile credit specialists contracts) and i own them R782 118.79 and they going to deduct it from me end of July. This is they price of a vehricle. I didnt sign any document with them. I didnt receive any phone frome them. I didnt receive any airtime/data of the value of that value from them. I didnt receive any invoices or notifications or bills from them in the past. I dont know how do they get such a amount but im not going to accept it. Im also not goin to accept any unconvinionce and will gladly take this matter to court on their cost.