charging me for calls but i still have minutes free - *******

i have caught you out !!! haha, two months ago you charged me for calls because i was supposedly out of minutes, so this last month i ran *111# and got a detailed bill every day, i still have 110 minutes free carried over but yet again you have charged me...!!! surely this is ********... i want my 464rand that you charged me two months ago paid back as i knew i could never run out of minutes... it hasn't happend in 4 years, but all of a sudden its happening and as per your call center lady now on the phone has agreed that i did NOT run out of minutes and still have 110 remaining from last month!!!!! *******....... explain explain. 1- ********** **********