1) generally in case you fail to pay balance amount builders tend to deduct 10%of earnest money paid .
2) in your case agreement for sale is silent on said aspect .
3) since builder is willing to pay you Rs 70,000 accept it .
4) litigation costs for recovery of rs 30,000 would be more than amount sought to be recovered by you
5) in case you so desire you can file complaint before consumer forum in Hyderabad for refund of money with interest . agreement has been signed in Hyderabad. property is situated in hyderabad . case before consumer forum take around 2 years to be disposed of