Issue with Bill Payment

I usually use my Clicks App to pay my bills and pre-paid wifi. Yesterday I paid my wifi and the transaction was approved and the funds deducted from my account. I then received an email from Clicks saying there was an error with the transaction. I just called them because I didn't hear anything from them and was advised an investigation can take 48 hours. This is not very good customer service. I work from home and need my services activated. I don't understand why it will take 48 hours to investigate but the payment was taken. I wouldn't recommend the Clicks app for important payments.