Let down at crucial time of month

Was given a new meter by George Municipality 2 weeks ago and immediately contacted Prepaid24 who I use for my purchases and updated with a consultant who confirmed meter number was changed and that I could confidentally purchase electric from them. Have just received a reminder that electric goes up tomorrow so tried to purchase in advance only to be informed they don't have my new details. Can't get hold of them on weekend as unable to find a tele number on the website. Tried to go in online but site wont take my username and password in spite of being with them for over 3 years or more. Moral is don't blow your trumpet about increasing your business to their obvious benefit unless you are on top of headaches and the ability to handle them ASAP.