Terrible service on a new contract

I took out a new contract on 17th Jan. After one day the device stopped working. I returned the device on Satarday the 20th, The agent at Telkom JHB CBD told me he's booking it in for repairs. From that day i never received my device, I get a new Ref number every day from the repair guys. No one is willing to help. I have no choice but to cancel the contract after writing this complaint. I cannot believe i have to pay for a device i used for only a day. Worse part i have insured the device but they also useless,.