Byju's — I extended my subscription, but access is denied. (I'm not getting a service I paid for)

I first bought the Byju's IAS course in 2022 which was valid till December31, 2023. I extended my course for one more year (till December 2024) which was costing 24, 000 rupees.
When my first subscription got expired on December 31, 2023- my all the access were blocked as if my purchase was ended despite the one-year extension. I've mailed and called them many times and only respond I'm getting is - we're escalating your query, and it will be resolved within 2 days.

It's been 12 days today and they're not providing me any access of class or test series and their order can't be cancelled as they have 15-days policy but how would I know that I will have such issue because the time I extended- I was already consuming my first purchase which was till 31st December.

Long story short I'm not getting the service I paid for.