Zomato — Im complaining about the my refund status

I was given a promo code for spoiled food in zomato which was valid for 30 days only. Due to the covid lockdown zomato stopped working and i wasnt able to use my code. After zomato opened again i raised an issue with the customer service and they said they would renew the promo code but that doesnt happen and when im trying to contact im unable to do that. Very very pathetic service. I definitely want my refund back.