Poor Service from ADT

I have a month to month contract with ADT. I called them and sent an email on 1 November asking them to cancel my service until further notice. On 1 December, I will billed for the service for R778.60. I was told that they would process a refund, which would take 7 days. The 7 days have passed, and no refund was paid. I called again, and am now told nothing was done about the refund, and I will have to wait to weeks for the refund to be processed. Really really poor service from ADT !!!!