Consumer request for contract and service cancellation telkom

I was a telkom customer for 4 years now they send me a message at the end off November 2017 to renew my phone I went to trade route telkom mobile store and I spoke with ashwyn the sales person so I took out my new phone the Huawei p10 plus with them they gave me 10 days to check if the phone is right they actually gave me a faulty phone which the battery was dieing in 4 hours I took it back to ashwyn he said they will send it for fixing when I went back a few days later it was still in the store so I asked them to give me a new phone or cancel my contract ashwyn brought the cancellation form he signed and I signed it he said it will be cancelled on the 9th off January 2018 I waited nothing was done I went back to the store today and he told me it's still pending which I think his massing me around and now 2 months they taking out 1385 from my account for nothing what should I do now must I bring my lawyer in take them to the rising sun I'm so upset even head office can't help me I must say they service is very very bad they must catch a wake up and deal with the customers properly