Zomato — did not receive complete refund

I placed an order thrice with a restaurant which declined my order twice and did not deliver the third order at all. Eventually i had to cancel my third order. Zomato support executive assured me a full refund of rs 252 and offered me a "free meal" promo code of rs 50. However, they refunded only rs 202 instead of rs 252. When i complained, they repeatedly gave the same excuse that the remaining amount has been given as a promo code. Is that what zomato means by "free meal" promo code? Not refunding the complete amount and converting the amount paid into a promo code and marking it as a note of apology for my inconvenience? Extremely unprofessional. I want my full refund of rs 252 asap. Its not a matter of rs 50, its a matter of cheating the consumer which is completely unjust.

Order number [protected] dated 20th november 2019 at 9:00 pm