Cancellation delay's and unhappy service from the company.

I went online to request a call back regarding taking out a new contract with the company after holding for awhile and after not been answered I than called in and was helped by a sales consultant. We concluded the sale by purchasing the unit for R59.00 because I had advised them that I have an existing unit on the car and wanted a supplementary unit that wouldn't use the car's battery. The installation took over two weeks for them to make contact with me and arrange for an installation. I than requested that they cancel the policy and within a few hours I received a call from retension's trying to arrange for the unit I signed up for. But instead the nit that was installed was the one for R99.00 and since than the car has been giving battery problems. I called in and was given a reference number and was advised that someone would contact me to finalize the cancellation. I have not received a call as yet and when I send them emails they come back as undelivered and I have been blocked.