Link not working

My link has not been working for 3 weeks now with ticket number SST849591 - SST844150 Every time I contact the call centre they tell me to disconnect the cable and put it back in with no resolution. An agent called me on Saturday telling me the serial number is not correct all of a sudden but the same serial number has been working for 5 months since I’m with supersonic. I logged 3 tickets and one has been closed with no resolution. This is absolutely poor service. I cancelled this service online but they telling me of the 30 day notice period I can’t wait that long I want this link cancelled so that I can move to another service provider that is working and servicing their clients. I have to buy data every single day which is costing me a lot of money when I have WiFi. No one is trying to assist me with solving this problem. I have to keep contacting the call centre and they don’t even know what they are doing, they are lost themselves. I am now sick and tired and want this thing cancelled because it’s a whole month now that my link is not working it’s pathetic.