WATER BILL UNACCEPTABLY HIGH

Our municipal account (which only includes water, rates and sewerage - no electricity) has more than DOUBLED over the last two months. We are three middle aged people living here and water gets used sparingly. Last month our bill was over a period of 45 days (R4354.05)!!!!! Our normal bill is around R1400 - R1700. Good heavens how are we to pay this. This month (over 28 days) it was R3900. Someone is definitely got it wrong How on earth are we supposed to afford this type of bill? Have the people at COCT gone totally MAD????? Is someone going to respond and help me understand what is going on???