Poor seervice

I moved into new premises in June, and immediately encountered issues with the wifi. Despite numerous attempts to resolve the problem, including hours on the phone and a visit from Open Serve, the issue was not resolved. I canceled the service on July 21st, but despite my explicit request, I was billed again after canceling online on August 28th. I have paid R600 each month for the last four months of non-service, and I am extremely disappointed by the poor customer service and refusal to refund the last month. This situation is unacceptable, and I expect a prompt resolution.