I recently sent minnowbooster a couple of sbds to upvote one of my post. They usually vote after only a few minutes. But I waited almost an hour and no one voted. It was almost my sleeping time so I thought lets wait and went to sleep.

But even in the next morning they didn't. So I went to their discord and cordially asked the reason of delay.. They had a node problem. Some of steem blockchains node were clogged because of a bug.. so minnobooster had lended their private nodes to steem. After one day or so they upvoted me with twice the amount even after excluding the curation reward...

Usually if you wait a day or two they will upvote you with covering your losses. But if they cant atleast they will return the money. If they don't do anyof the said things just go to their discord.. with a proof that you send the money... all of the bots has their own discord channel. They will help you with the rest.. No need to worry.