Zomato - Zomato customer executive lying and confirms of something which isn t honored

I have a long standing account with Zomato - Restaurant Finder and Food Delivery App.
I have bought Zomato Gold membership costing Rs **** on October **th **** at *:** AM IST after seeing the promotion that I will be getting **** Zomato credits on buying the membership. What I missed is I have to enter "DIWALIGOLD" promo code to get the credits. Instead I have entered "ICICIGOLD" promo code which I saw at the last minute to get **% discount on **** Rs.

After noticing that I have not received the Zomato credits added to my account, I contacted Zomato customer care on October **th **** at *:** AM IST to chat through the support button on Zomato - Restaurant Finder and Food Delivery App. Zomato's Customer support executive, whose name is no where to be seen in the App rightly pointed out that I did not enter the "DIWALIGOLD" promo code. I did not want my yearly Gold membership to start on a disappointing note and hence I pleaded with the guy to give me credits as a one off case. For most of the time he said he cannot do anything but finally he said the below exact words:
"What I have done for you is I have forwarded the request to the team.
They have checked that you have applied the code successfully :)
You will get the credits within ** to ** working hours.
Hope this will help you now :)"

After getting confirmation from him that I will get the **** Zomato credits within ** to ** hours I was delighted. I kept checking my app to see if the credits got added every hour but it never did. I waited for close to ** hours and then when I finally contacted the Zomato customer support through chat option again on Nov *st **** at *:** AM IST, customer support executive again started from where the earlier guy started. He started saying that I did not enter "DIWALIGOLD" promo code. When I told him about the chat conversation I had with the other executive, he simply said that the earlier executive gave misinformation and apologized for giving the misinformation. When I requested for sending my own chat transcript of my conversations with Zomato customer executives, he says that he cannot send the chat transcript as they have something to hide. I can share screenshots of the chat I had with the customer support executives.

I demand to know how can one Zomato customer support executive give one information and confirm that I will get the Zomato credits and another executive says that it is a misinformation. I was so happy for two days but now I am just left with disappointment. I want to actually cancel Zomato Gold membership but cancelling the membership is never an option according to their Terms and Conditions. How can big corporate companies always get away with what they want.