I handle my mom/dads account, the account is under...

I handle my mom/dads account, the account is under my moms name, Sandra Faulknor. I made arrangements to pay their utility bill (pwr & water) on Friday, 02/02. I usually have to make arrangements every month due to the timing that their bill is due vs when they receive their disability check. Anyways, I forgot to pay it on Friday so I paid it as soon as I remembered on Monday, 02/05. I received a confirmation email from DU stating "Thank you for your payment to Dalton Utilities. Your payment has been processed and your account has been updated." Well the next day in mid-afternoon, Tuesday, 02/06, a whole day after DU had received the payment my mom called me because her water had been cut off. I called DU & was advised that even though I had made the payment a disconnect order had already been processed & their automated system did not know the payment had been made. Oh they sent it for reconnect but told me I would still have to pay the $75 reconnect fee. I questioned how their automated system could not know the payment was made but their automated system sent me a confirmation email saying the payment processed and that my account was updated? Supervisor, Amber, didnt have an answer for that and said she would look at the account & call me back. I know we have to make arrangements almost every month & again that is due to the timing the bill is due & the date my parents disability check comes in BUT how can you seriously justify getting payment in full, sending a confirmation email saying the account was updated successfully, and still disconnect the service a whole day after you get your customers payment, & then expect the customer to pay the reconnect fee? YOU HAD THE PAYMENT A WHOLE DAY BEFORE YOU DISCONNECTED THE SERVICE & I HAVE THE EMAIL SHOWING WHERE THE ACCOUNT WAS UPDATED SHOWING IT PAID!!!! I posted this review several hours after speaking to Amber, have not heard back from her yet. I'm also planning to file a complaint with the Georgia Public Service Commission or if they do not handle Ill find out who to file the complaint with. I do realize it was my fault for forgetting to make the payment but I took care of that and paid it all in full the very next business day and again a whole day before DU sent your tech to disconnect the service! Also as I think about it, why just the water? I mean the water & power are all on the same bill? I think the account was updated which is why the power wasnt disconnected but somebody dropped the ball & didnt update the water portion and now DU is trying to justify the $75 reconnect fee. Very poor quality of customer service. I admit the error on my part in forgetting to make the payment but I did everything to fix that error and avoid an interruption in service and I have an email as proof that DU did get my payment and update my account. Still DU does not admit their error is this situation. $75 is a huge deal to a disabled couple on a budget just trying to get by.