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?
Post here the txd to have a look over your transaction, after click send, advanced options you can set up the fee https://gyazo.com/c0f0a581d0c0620861e42b5ea58731b4
maybe it will work with double spent. I did it many times but more sure now it is too late