2Checkout Payment method determined the transaction by their fraud proceessed. If 2Checkout determined transaction as fraud then they refunds full amount. If you get refunds full amount then you should choose another payment method. Generally refunds 3-7 busineess days.
If you new clients you must pay invoice another payment method whether your get refunds or not to active service. If you existing clients you just wait refunds money and you get refunds then you must pay invoice. For payment delay your service not hamper.