Vodacom ******** customers

In 2018 I took a contract with Vodacom for two years. The contract was appealing as it came with another phone for free. I was happy with this and app**** for a the contract. When the phones got delivered I realised there were two sim cards in the package. I called back and spoke to them and was told the 2nd SIM card was free and I was not charged for it. Last year I contacted Vodacom and asked to my cancel my contract. They confirmed that it was cancelled but I was still debited the following few months and did not understand why. I found out recently from Vodacom that I didn't cancel my 2nd SIM card which was confusing to me as I had one contract. Now Vodacom has handed me over to lawyers for an outstanding amount on a contract I never wanted. Vodacoms website doesn't have an email address which I can contact them and I cannot phone them as I am not a Vodacom user. I hardly ever used the sim cards they sent me and now they are debiting me for a contract I never asked for