Charged double and Unable to make calls

I went on MTN active mid month to check my account balance, the statement showed I was being charged for an extra service 'PROMO SERVICE FEE'. I called MTN to dispute this statement as the contract I had signed for was for R579 pm, reference ***. The consultant did agree that this was incorrectly charged as this is not the cost for a 200 anytime minute contract. She advised I go into the store where I signed the contract as they may have loaded it incorrectly. This inconvenienced me but I went to Sandton City where Stella took my details and my complaint, not sure what she did with it.<br> <br> Last week I received my invoice for R1158.01. This is more than double of what I should be paying. The Debit order went off from my account. On the weekends nobody seems to answer the 808 number. This morning the consultant says the system is down and I must call later & this is going on for 3 weeks.<br> <br> Furthermore when my airtime expired, I loaded purchased prepaid and could still not make calls. I had indicated that I would like an open contract so that I can still use my phone when my airtime has expired. I expect the incorrect amount of R578 to be refunded to my account urgently!