Bad aftersale service

July 28th Vodacom direct send me a laptop contact and I phoned them just after I received it the next day to be send back to them and cancel the contract,but everytime when I call them they promised to send RAM to pick it up from me and every time when I called them there were empty promises and only on 11 September RAM came to pick it up ...on 13 September Vodacom send me a sms that parcel is returned ....I phoned them on 21 September to find out if contract were cancelled and the person told me not yet I must wait and on 27 th of September I phoned again and still not cancelled meaning this is the second month I'm paying a contract I don't even have ....If I ask for a supervisor to assist me the say can't help me and all supervisors work from home and I can't talk to any supervisor ...