Cant get hold of person who contacted me about upg

i was called over last few days by a woman over my upgrade, i finally went for a contract but after reviewing this i want to change the upgrade, after many attempts to get through on *** i keep being advised the number does not exist, ive been trying the whole day with your 180 number but they have no clue and after phoning all your branches in cape town im still at a dead end, i need some assistance as i will not accept this contract.