VOX Telecom bad service

Over 12 Hrs after accepting a 10 Gig top-up it is still not supp**** I have made numerous phone calls and have not been helped, no less than five calls and now it seems that they are not answering my calls as it rings for over 10 to 15 mins It is impossible to get management to call me to resolve the issue and I cannot get transferred to the CEO PA The head office phone number as it rings and is never answered