EXPIRING PAID AIRTIME

I have been out of the country for six months when I came back checking my airtime it's so little I called support and I was told after three months airtime expires. This is the airtime I am paying for every month meaning that I am paying for airtime they take it and sell it somewhere else yet should you miss a payment even if by R100 they block your phone when opening it they charge you again. Please I am pleading with ICASA to do something to help citizens. I feel that this is ***** really