MTN is a ****

I took a R299 for 100gig data with MTN in mid February. On the 11th of March the network stopped working and I thought data was finished but did not understand why. When I contacted cell C they told my account was suspended without explaining why, they reconnected the number on Monday. Surprisingly now I get my invoice to the amount of R1000 with a new type of gig which is R30 gig and the amount was debited on the 11 of March...the connection also reflects that it was made on the 11 of March. I request that Cell C doesn’t temper with my account and inconvenience me because I don’t have the money they are going to debit on the 20th