Credit not done

2 April 2015 I received my Debit order as usual but i saw there was R79 more than what i agreed to when i upgraded my contract. I got onto the phone the call center and i waited about 40 mins to get through to a operator, who fortunately was very kind. I told her my problem and she saw that there was an extra 500mb package added to my contract which i did not authorize. She reversed it on the system and told me that it would take 24 hours to process the credit to my account. I phoned back on 7 April 2015 and after 5 attempts of which i was disconnected suddenly, I was told that it was in the \billing queue"and would be processed in the week. I tried phoning today (10 April 2015) and was disconnected after 12 mins. I do understand that there is high volume of calls but to have my credit not processed after a week is unacceptable. """