Uber India — overcharged as per the invoice

Address:

Kolkata, West Bengal

I booked uber on 19/09/17 at 3:41pm from salt lake to bansdroni from my reg mob [protected]. As per estimate it was rs.139/- but when we reached destination driver was unable to show me the trip amount and asked me to pay as per estimate. So i pad rs.139/-. Later it was found that fare was rs.31.50. I asked uber to send me actual invoice for my personal use. They admit that they got rs.131/ but due to technical issue they unable to give me actual receipt. I really require actual receipt for my personal need. After writing so many times by mail they don't issue actual receipt to me. Please look into the matter.