MTN overcharging me and giving poor service

for 2 years i could not have my caller identity activated , i have been calling but no solution . this was only done 2 weeks ago. imagine being unable to return calls

the other most recent experience is , i had my data contract which was enting end of march , i called in and cancelled , but up to april i was still paying for it. i am asking why there is still no explanation . now in May looks like they have cancelled but my bill is 200 more that what it should be , noone is explaning why.