Prepaid electricity problems

We are pensioners and we always pay our municipality bill on the 10th of each month when we receive our pension. We paid our account on 10/01/2019 at 09:24. When I bought prepaid electricity on 11/01/2019 at around 16:00 there was about 30% deducted for account in arrears, if the payment were made at a different store or with EFT I can understand that the payment did not show on their system, but the payment were made at the municipal office, according to me the payment should have shown on their system immediately. This is not acceptable as there is a budget for electricity, this now means there will not be enough electricity to last us the whole month, I feel that the money deducted should be loaded on my Prepaid meter by the municipality as my account was paid in full. Several people complained about the same problem. this is not the first time this is happening.