Cell C emergency airtime *******

Good day i hope this review reaches cellc and someone calls me back because i normally use cellc advance airtime and for some reason on the 17th of September i tried using the advance airtime and took 500MB and when i checked my balance i had 0 MB so i tried again and again and i probably did it about 10 times however when i woke up the next morning all the times i tried it actually went th rough now i owe cellc a R220 in advance airtime and i only use to qualify for R30 maximum.However i called in to cellc customer service which is of no use because they can never help u and i got a case number for the query i logged but nothing has been resolved so im rather switching to vodacom because now i cammot recharge until I this 0problem is resolved which i think is really unfair towards me