MTN dissappoints

My contract ended and they have been calling me on and one about upgrading to a new package which I cannot do right now. I have been getting so many sms's about defective billing this month and this and that and now I see my account is like 800 more than last month and my account has been steady 1257.99 every month for the last 2 years,,,? I cannot call more than what is allocated and my data is a set package so how can my account suddenly be higher... No I must go to an MTN store, spend hours upon hours to sort out this account and it is at their fault! Who reimburses me for my time lost as I am unemployed and need to earn money every hour of my day to try and survive?