NO SERVICE FROM SUPERSONIC

In the meddle of February my Wifi went off. I called numerous times and no one could ever give me a answers as to why I have no WiFi. I phoned in over 25 times and every time I had to explain again to the person that I have no service. Still they can not give me an answer. I finally had to cancel my subscription with Supersonic on 24 February. After I cancelled I called again because my new service provider said that Supersonic did not release the line. Today I called again and was told that they are not aware that I cancelled!!!. On 24 Feb I received an email from Supersonic to say that they did received my cancellation and someone will get in contact with me. So now again I have to be penalized for Supersonic not doing their job. My debit order went off yesterday but I have not had any service for more that 3 weeks. This service is really the worst ever. Even an Afrikaans man called Reinard spoke to me after several complaints asking me what is the problem. I told Reinard that all the calles should be recorded, he agreed that all the calls are recorded. I told Reinard to please go back to all the calls I made and then get back to me. Did Reinard get back to me?? NO!!!. So what ells do I need to do to get this subscription cancelled and back dated to 24 February. And what ells must I do to get this line released to my new service provider? Here is the case number: CAS-989872-M3G7N7.