If less reaches the deposit address than you were quoted, the deposit is held rather than credited, and it shows as partial. Usually that is a fee taken at the sending end, or two sends that each fell short. Send the difference to the same address and the deposit completes on its own once the total covers what was expected — you do not need to start again. If the address has already expired, or you are not sure how much is missing, send us the transaction hash and we will reconcile it by hand.