Put in Debt by Vodacom for a contract I didn’t consent and I phone I don’t even have

A few months ago I tried to apply for Viacom contract, they didn’t approve me for the phone I wanted so I declined. Few weeks later a call Center agent keeps calling me offering me this phone I didn’t want, I kept declining. Till she decided to approve the contract without my consent. I found out when they delivered the package and I sent it back as I said countless times I don’t want it. It was returned however they debited my bank account without my consent yet again for this same contract I declined. I went to the V&A Waterfront store to get assistance they could really help me . Now I’m being called and harassed by a collection agency called vvm for a contract I don’t have , for a phone I don’t have, I don’t even have a SIM card from VODACOM. I have been calling and asking for help with failure I don’t know what to do anymore chance I’m writing here. My name is being damaged for something I don’t even have that I didn’t even consent nor signed for..