Worst fibre service ever

I have had the worst service from Vodacom, I cancelled my fibre line in January 2019 to stop end February by sending an email and received SR190 ********** 23 number, as I have moved to an area where I don't have fibre and they cannot assist me with any other internet service in the area due to bad signal. when I queried in march because I was billed for March it was discovered that my SR request was not actioned, Anschen emailed me apologizing for the error and sent me a cancellation quotation, I accepted the quotation at the end of March but still received a bill for April again. why is Vodacom billing me for a service that I am not using since February. now because of their error I am paying from March for a service which I didn't use and I have to pay for my current service provider for my Lte. Is this not theft. I have sent another email on 15th April after speaking to ***leen Snyders in the fibre contact center who informed me that Vodacom have again billed me for April I sent an email to ********** addressed to Anschen but I did not get a response, I sent it again on 16th April and I didn't get a response and I have sent it again today. I am so frustrated to the point where I feel extremely irritated, why cant we get a resolution immediately? why must the contact Centre send emails to the back office every time and nobody gets back you. I will never recommend Vodacom fibre to anyone ever. This is causing me emotional frustration as well as financial issues!!!