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If you buy an upvote and receive it then nope, there are no refunds for successful upvotes.

example i send 0.5 sbd but i recived 0.2 upvote then? @cardboard

Then yes, you will receive automatic refund of about 0.38. The difference is always refunded.

i send. 50 sbd twice but it return my sbd. i want your upvote service

Try now :) remember the post can not be older than 2 days.

yes my post is just 19 hours old now i send 1 sbd 6 time but it give back