Sending a transaction with very low or no-fee's can cause the transaction not to be confirmed in meaningful time and then they delete it from the node.
Sender can re-broadcast the transaction tho, and also; the other nodes can process your transaction, but it is not guaranteed.
Sure hope u didn't trust an unconfirmed transaction..
Thanks for the information ajareselde, unfortunately support from the sender is non-existent at the moment, is it even possible to contact a node to request re-broadcast or can it be done from bitcoin wallet?
The amount in question is 0.049 and no i did not attempt spend it while it was unconfirmed