Credit back my money for the service i never recieved.

This company has given me the worse service ever. I took out wifi end of July and it did not work and was deducted pro rata and was told i will be credited back, till date no credit has been made. For the month of August i was off for 8 days and yet today they deduct the full months fee of R499. i HAVE SPOKE TO SO MANY CONSULTANTS THAT ARE SO RUDE TOWARDS ME!!!!!!!!!! EXACT WORDS FROM THE LAST CONSULTANT TUMELO '' THERE IS NOTHING WE CAN DO''