I was trying to exchange my bitcoin for my local currency yesterday on remitano.com. The coin already left me wallet, but it is still showing pending transaction. and remitano suddenly canceled my transaction. They did not even credit my wallet there. I want to cancel that transaction from my wallet and get my Bitcoin back. Please how do I do it?
you can always try to double spend one of the inputs of the transaction in a new transaction using a higher fee, and try to broadcast the new transaction...
If this new transaction makes it into a block, the inputput you double spent is removed from the UTXO set of the nodes, so your "old" transaction is now using an input that is no longer in the UTXO set, hence it will be voided...
BawsyBoss is right tough: the cleanest, most honest and easyest way to handle this problem is to contact remitano support.
BTW: could you possibly post or PM the tx id, that way i can have a look... It might also be usefull if you told us which wallet software you used to create the tx?