Not a happy client

Ever since i got the contract with them i have never got any airtime that was promised to me upon taking up the contract. When i don't pay they run to ITC to list you as a bad payer but take forever to update when I keep up to date with the payments. Why must I pay for the airtime that i'm not getting from these guys, i have stopped paying them. Their call center is useless, i never get to speak to anyone there hanging up after holding for an hour.