If you chose some good bots, it is very rare that you con't got an upvote.
Sometime delays occur due to some problems with the bots. but mostly in such cases bots either refund the money or upvote once the problem is resolved.
I have encounter this situation few times but I got my upvote/ refund after some delay usually a day or so.
If you encounter any such problem, it is suggested that you should wait for some time.
After waiting for some time if you still unable to get then you can talk to the bot owner with evidence. I'm hopeful that you will get the response from the bot and get your amount back.