If a property sale in Uttar Pradesh hasn't gone through, you can apply for a refund of the stamp duty paid. You'll need to submit the sale deed explaining the failed transaction to the Tahsildar, RDO, or SDO. The authorities will process your request after scrutinising the documents, deducting 10% of the stamp duty. For unused judicial stamp papers, the concerned court will issue a certificate, while for non-judicial stamps, the State/District Controller of Stamps is the authority.