Dear Sir,
before going head with the options;
whether the agreement executed is registered or not. the terms will regulate the further course of action.
is there any termination clause for terminating the agreement, if yes what are the wordings, if not, In the process of cancellation basing on you allegation, needs to substantiated with the evidence.
the intention in cancellation of agreement should result in way of refunding the amounts as were given.
better to approach the advocate with all the documents and apprioprately issue the legal notice followed with recovery of amount.
accordinly follow with up due process of law .
Regards,
S.Sateesh