This is my response to you:
1. Find out if the SPA was registered or not;
2. Since it has become compulsory to register a Power of Attorney especially if it has a sale clause in it;
3. Only if the documents are clear, the title is clear, the title search report is there with you, the 7/12 or 8A form is present, if there is no other claim and there is no pending case/dispute in court then go ahead with the purchase of the property;
4. Engage services of a local lawyer or you can yourself approach the Registrar and find out about the SPA if registered or not.