Unfair penalty charges on impact water bill

I have been with impact meter since 2011. For the fist time 2021 November and December, by pure mistake. Under payed my account by R580. My water is normally under R1000, i always transfer R1000. Normally my account is payed in advance. This is where my amazement comes in, i get charged a re connection fee and on top of that another R2250 ( deposit increase) as it states on my January bill. When i called the accounts department. The person just said its part of impact meters terms and conditions. That when your account is in arrears. They double your last water amount and that becomes a penalty. The lady said not to worry, when you close the account i will get that R2250 back. When i tried to explain to her that i am the owner and wont be closing the account for the next 20 years. She hung up the phone. Stated that i am very rude to her. And just hung up. I still had to pay. For the fact that they block your prepaid meter if you don't settle the account. Seems that the public has nothing to fall back on. It seems i bit unfair to end up paying R2250 plus re connection fee. For a R580 short payment.