very bad service

i got a samsung tab about 3 weeks ago, i called the activations number and was told the sim would be activated within 48hrs, up to today the sim hasnt been activated. i call them almost everyday the never answer the phones, i end up holding for long it rings one way or sometimes gets cut. First they took long to deliver then they gave me a story that their courier truck got hijacked. now they dont wanna activate my sim, i even sent an email to them yesterday. no one has bothered replying. this is very disappointing because the reason why i took the contract with them is because i do have an existing contract with telkom and they have never given me such terrible service. it is really giving a bad name for telkom. Please i need my sim to be activated ASAP or if not i need details on how i go about cancelling the contract because really its of no use to me. [Email Removed]