Paid phone cancellation

I have cell phone contract with vodacom, I have been with vodacom for over 3 years now. I took a p20 phone that came in with a promo line, i have finish paying for the P20 phone. Knowing how vodacom operate I decided to go in store to cancel the contract since am done paying. I went into gateway store to cancel both lines, we called from vodacom store to make the cancellation online, when she took the request of cancellation shr cancelled the promo line which wasn't what I ask her to cancel, I ask her to cancel the main line. Unknowingly I taught my line was cancelled because I had a new contract with them, ending of the month I saw in my bill that they still charging me for a phone i already finish paying for. I went back to the store to logging in a complain to vodacom and querying it, the report was log on and I was ask to wait, this report happen June, I have been going into the store over and over again for God knows how long and nothing has been done, the store had sent several emails to cancellation department and no one has responded or even acknowledge the email, I went as far as speaking to the HOD cancellation Tembeni this was on 25/ 08/2020 about the situation, he promise to escalate the issue which he did but nothing was done, they took the matter out again. I have been chasing vodacom for long period now on one simple issue but they disappoint me. Just to tell u how unreasonable and wicked vodacom could be they decided to block my account and refuse to credit my monthly airtime or data in my line.They have not responded to me or any of my emails or even the emails that has been sent by the store to query. Vodacom have decided to send my account into legal department because am not paying the account. Please will you pay an account that has been overcharged or have queries on it. They are suppose to credit me but they have even refuse to attend to the matter, but they have found justification in abusing my right and blocking my phone. I don't understand how long it take for a professional company like vodacom to rectify and issue that is on record. I find this very disgusting, unprofessional, I will never ever recommend vodacom because for over 4 month I have been going back and forward. I have never refuse to pay my account, but here I am buying airtime to phone them while they keep me waiting, I have reference of calls I have made to them uncountable times no answer. I am so upset and angry, I have never been so humiliated like this. I find this as theft and abuse. They have *********** staff that don't care about others or even pay attention in serving humanity. Calling vodacom cancellation is like long walk to freedom they have no empathy. It very embarrassing to no such company treat there customers as such.