Need help on a tricky Situation on property

A property of mine was brought on 2013; All records were checked with respect to landlord; In sub registrar office, land + home [ property ] was registered to the owner; and EC clearly said the same; that he had an loan from one of the bank. So as was EC was clear from past 12 years, we went an purchased the property; by paying the money; owner went and cleared the dues from the Loan which EC had and he registered me the property; and all khata and everything was transferred to me. During registration he handed over all the originals to me; i took the loan from SBI bank and registered the property. Now after 1 year; few banks started approaching us saying that they have originals and he had mortgaged this property before 2013, one in 2006 / 8 and other one in 2010. one of the bank even showed their document; and came to know that it was a color xerox. Now there is one bank; who has put the execution case ; again they say they have mortgaged during 2010; But the real ;part is; during that time there was one more bank which had registered in EC [ Which i brought it ] ; they have not checked it. We came to know the case and we put our objection to it. Even though we have originals; How do we get away from this. Judge is extending this and opposition is saying he shall object it. Need an help here and ideas. This is a tricky situation; even though we have originals and all are registered in our name. This mortgaged banks has all fake documents [ color xerox ] , but what to do here. Thanks