Use of contracts is useless 100%

Bad mobile contracts, I since paid off my contract 3 ago years yet I still annoyed receiving sms and phone calls, threating me, that I owe cell c an upgraded contract I didn't request, neither nor received the phone or airtime for it. But they want me to pay. ""#ALERT: Phathakge, your owe Cell C, ND ********** 3 R527.69. Immediate payment is required to avoid your file being referred to a specialized dept. Tel ********** 656/ Whatsapp ********** 612.#"" PEOPLE SHOULD BE CAREFUL CREDITORS ARE MASQUERADING as Bullys THIS DAYS FOR high commissions all corners the easy stunts and the *****ered way.