Eskom Overbilling and can't tell me where our payments are or went and our account was closed by them

So we had an eskom bill that was very high and eskom stated we needed to have meter checked we then went through the process of checking the meter and it was stated there was an issue but now in this time before checking the meter we were paying big amounts on the account. Eskom for some reason then came back to us and we suddenly had a credit. After the credit the account was closed by eskom. I then enquired as to why it was closed. They quickly re-opened the account and now we have a bill of 25K? Sorry from a credit of 4k in January and now 25K in September? Sorry where and how is that even possible? I want this resolved ASAP Eskom