Can you reverse airtime for cash at capitec bank or cellc?

I meant to buy R100 airtime but i mistakenly bought R1000 airtime and i nearly experienced a mini heart attack. I did call the Capitec bank and the Cellc service for reversal but they said they are unable to reverse it. The only option i have is to post on my social media that i am selling airtime for cash. I am deeply disappointed.