INCORRECT BILLING - NO RESPONSE

We recently joined Iburst, in the first place the sales consultant said there are no additional fees we pay just R599. We left enough money in account for debit order to run. Debit order did not run and when my husband finally got hold of accounts they said we owe over R2000, we said impossible and then they realized they made an error and so the debit order returned to them because they tried to submit so much while the error was on their side. They duplicated our invoice and said to my husband we must pay an additional 399 as well. They promised to send an corrected invoice - NEVER DID STILL WAITING AND HE PHONED THEM SO MANY TIMES. Still no correct invoice. We paid R600 and he sent them proof, but still no correct invoice nor statement. This is sooooo unprofessional, after services is pathetic and consultants/accounts are useless! We are scared they are going to submit an incorrect debit order once again and we will not get the funds back.