Presumably when you purchased the property you had access to sufficient funds to complete the purchase and you qualified for finance, but the value of the property has now dropped. The problem is that you don't have sufficient finds for your deposit and closing costs.
If this is the case, have you approached your lender to see if there's any way they could help with a personal loan or similar? It doesn't work for everyone, but it might be an avenue to settle.
If this is the case, have you approached your lender to see if there's any way they could help with a personal loan or similar? It doesn't work for everyone, but it might be an avenue to settle.