Cell C
Stop my account due to bad service

Hi Peter
Can u pls assisst i had a Cell C account that i stop last year due to deducting to much money for no reason, i Emial
U about 3 to 4 times last year and telephone calls to Cell C call centre to no avail, i dont whant CellC to send me accounts they are so bad that would like no person to take contracts out by them, pls Peter what must i do to stop them from sending account.
THANKS PETER