Horrible service from Vodacom

Hi, I ordered a laptop in February with Vodacom and they sent a wrong package when I called them about it they said the package will be collected. This took almost 5 months while Vodacom try to debit money on my account; the package was then collected on the 27-08-20 since then I've been now trying to cancel the contract but nothing is happening. This has affected me a lot, my credit score, verbal abuse as they wanted money and sent threatening emails to pay. Here is the account number I***-5. I can't go to the shops as they say it was done online they can't do anything about it.