Vodacom breach of contract

On the 23 August 2018 I logged a call with Vodacon to complain about the reception where I live. Vodacon agreed and told me that there was bad reception and they promised to fix it. It has been 7 months and I still can't use my cell phone when I am at home because Vodacon still have not addressed the issue. To make matters worse, I am still being charged every month for a service I am not receiving. Vodacon are ***** and theives who are *****ing my money every month and won't even have the decency to give me updates even though they promise to. IT'S BEEN SEVEN MONTHS SINCE I FIRST LOGGED A CALL AND VODACON HAVE DONE NOTHING!!!!! I WILL NO LONGER PAY FOR A SERVICE THAT I AM NOT GETTING!!!!!