Important sim/number deactivated

Very Disappointed. I am a loyal Cell C customer, I have had 2 contracts with Cell C for a very long time but decided to convert one to a pay as you go. Having both my contract sim and pay as you go sim in one phone, I have not had the need to recharge my secondary sim which was very much active as it was used for work purposes. I make calls from the contract number and receive calls from management and our Board members on the secondary sim which makes this number very important to me and now getting told that this number has been permanently deactivated as the sim was inactive makes me very angry, a simple sms or call would have been nice before this action was taken. Cell C let's hope that I can be assisted if not, I need to relook at my service provider.