Where is the loyalty

I have accidently bought R1000 airtime and was suppose to be R100. I did explain to them that it was a mistake. And I understand that they can't give it back but requested to take it off my account. This is the first time something like this is happening to me. I've been a client of Vodacom for more than 20 years. It was only a mistake . And wish that this can be a different outcome. There is no way I use so much airtime.