No response from senior consultants to resolve issues

I have being trying to terminate my account since April. I was called on my MTN pay as you go number..... "you are using more than a GB of data a month, we offer you a 2GB contract for R129.00 / mnth. and throw in a tablet for free" after accepting the offer..I was delivered a Vodafone tablet..I then realised that this is Vodacom and not MTN. On trying to shift the contract to my MTN number, I was told that this is not possible, as the number should have been ported prior to the contract agreement. Two shop visits were unsuccessful..."this is an online agreement and not a store agreement" "never accept an offer from call centre - always problems which instore cannot assist with" So there is no one to confront except call or mail to resolve an issue - yet nothing gets sorted. A string of emails that a senior consultant will get back to me, but no one does, only promises. Even got an SMS saying that the problem is resolved...yet no one contacted me to resolve the issue. Next email I sent, they will find out what happened....still no one gets back to me to resolve the issue. last email was 13 June 2018 .. to which I have not even got an acknowledgement that they received my query.....HELP!!!! I have changed my email address at vodacom shop ....to date I have not received one invoice, yet money is deducted from my account each month!