Zomato — Incorrect excess charge

My email is [protected]@rediffmail.com. phone is [protected]. Had a chat with executive then bought zomato pro in flip kart used 86 coins and paid 614 rs to buy 750 rs coupon. I asked and them only purchased to get zomato pro plus. Later when I was looking to upgrade being asked and forced to pay another 500rs.
For just 900rs zomato pro plus membership ended up paying 1200 and too much of hassles.
This has wasted my time and created pathetic experience. I want my entire rs 1200 refund for no mistake of mine
Want to avoid being caught in this daylight robbery