Deplorable Customer Service - MTN Gateway

I recently enquired about purchasing a data bundle at the MTN Gateway store. The attendee shared info and proceeded to complete the purchase without my written approval of the contract. I went in store within 24 hours to query why the contract was created and the attendant then attempted to cancel the contract with me having to pay a cancellation fee. I am now being debited for the monthy cost even though the contract has been cancelled and the MTN HQ cannot resolve the status of the cancelled agreement, nor can they provide proof of termination. The service is deplorable and a ripoff with little to no accountability emanating from MTN Gateway store. The excuses provided are that they are a subsidiary with no direct correlation to the parent brand. This is highly frustrating as the attendant now avoids my calls to get progress updates on the contract termination.