Unhappy Contract customer

I am a contract client at MTN. I was called by MTN on 1 August 2019 at 14:14 pm offering me a migration contract and the package included 540 minutes, 11 gigabytes data, 400 sms at R450. The sales person said he will email the contract documents and he did not. On 7 August 2019 MTN credited my account with less minutes, data and sms than what was agreed on. I called MTN to query and the consultant said she will escalate the matter and I told her that I no longer want the contract I want to go back to my previous package. MTN yet again credited my account today with what we did not agree on after I have received a text from MTN saying my query has been resolved. I am not happy with the poor customer service I am receiving from MTN and I am not willing to incur costs due to their poor customer service and the lies that they sold to me over the phone.