AIRTIME IS BEING REDUCED ON A DAILY BASIS

I purchased airtime in August 2019 which I have hardly ever used because this number is purely for text messages as this was my first mobile number. I called two to three times to enquire why I was losing airtime everyday as I use WiFi for Google purposes only. On these occasions I was told that I could not be assisted because I did not purchase airtime in the last 3 months. Now this is ludicrous. Why would Cell C want to rob and old age pensioner? This is theft. I am utterly disgusted with you people. Can you please refund all the money you have ****** from my account at your earliest convenience?