TELKOM send me wrong simcard

a sell direct call center offered me a contract of 2 phones from telkom, which i agreed and when the phone came i inserted the cards on both phones after some time the numbers were activated, after a month after receiving my bill i noticed that one of the sim cards number is different from the one activated. its been 2 weeks not calling Telkom and yet no one of their agents was able to help me, they don't know what to do, some say i must do this and that, i am truly disappointed with Telkom i need help