Unfair Electricity Billing

The electricity billing is leaving me with no money to buy food at home. I've been paying huge amount for electricity bills from January 2018 the bills at home have been R2,600.00 minimum. But in September the electricity bill have escalated to R3,700.00 which I've paid again in October it was R3,900.00. At that instance I've contacted relatives to assists me on paying for the bill. In November it came down to R2,700.00, in December it went back to R3,900.00 which forced me utilise the money that I was saving for Christmas. We tried to enquire with Municipality which we didn't get the joy they told us that they can't discuss the issue with us the person on the electricity bill must come and discuss that with them. The electricity bill is on my late mother's name. We are getting no help from Municipality and my worry is the other months I won't be able to pay for it and they are very quick to come and disconnect. My other main concern the billing system is charging us as per what we utilised. The more you pay for this unfair billing the more they increase.