52 minutes and still holding

I am currently on the phone with the call centre (Vodacom Customer Care) and have been passed from Data to Accounts and now back to the Data department. I have been holding now for 48 minutes and counting. My 3G data card bill has been R117.99 since April, and before that it was always R107.99 per month. It has never gone above that amount. This month the bill is R2,181.73. I am trying to query this but after being on the phone with Rachel in the Data department for about 10 minutes, she told me it is not a data query but an accounts query. She transferred me to Krisensha who I was on the phone with for over 15 minutes. After investigating she told me it is not an accounts query but a data query. She then put me back to the Data department where Phalesa picked up the phone. I told her I wanted to speak to a manager. That was exactly 12 minutes ago and I have been on hold ever since. In total I have been on this call now for 51 minutes. This is extremely unprofessional and unacceptable. I do not have this kind of time to waste! Please ensure a manager contacts me urgently on *** regarding cellular number *** (data contract).