***** at Vodacom over Fibre account

I opened a Fibre contracted with vodacom November 2020 as I was working from home which was R599pm. I received bill following month of R8600. I enquired on the cost and I was told took on another package besides the Fibre. I disputed that and canceled contract with Vodacom. I went to the branch to get more information and it's told to complete forms; get affidavit from.police station and I did all that. I called ***** department and emailed them several times and was told to await a call from Vusi. No call came. I kept calling with no resolve and kept sending emails with no response. 2 years later MBD calls me constantly saying I o Vodacom R18 000 and must settle the fee. How? Vodacom must resolve internal ********** and leaving customers out of this.