DATA PACKAGE FROM TELKOM

Some sales people from Telkom came to our offices offering a 2-year data package contract with free router through Telkom, which I took them up on. The person who did the contract was above Leopold van Rooyen who left me his cell no in case of problems. My router was delivered the next day with Heita sim card. Instructions were that sim would be registered/Rica'd by the courier company docs within 24 hrs. Now 4 days later the sim card is still unregistered and I cannot use the service. Van Rooyen's cell number is on permanent voice msg system. Heita customer care can't help, neither can Telkom in store - both point fingers at the other. I want to cancel this contract, but where?