Cell number cancelled

Good day, can someone please advise as to how I can have my number re-instated. I called the 111 number last night and was advised that my number has been cancelled. They could not assist and requested that I call the *** number. I tried that this morning and after being on hold for 35+ minutes, I gave up. I have had this number on contract for over 10 years and just recently converted to prepaid as I do not use the number regularly as I have a company phone. My email, etc is linked to this number which I require access to. I have also loaded airtime onto this number. So I cannot understand how Vodacom cancels a number that has a airtime balance. Please advise urgently.