Cars24 Services — Regarding refund against excess payment

I have purchased cars from the Bata Chowk Faridabad hub. Where I have been offered tata altroz of Rs. 754000 but after my visit I have been offer discount of Rs. 10000 but at the time of delivery I have to pay the remaining amount for the car but Rs. 10000 was paid extra due to their mistake and issue in the system for which I have been ensured that it will be refunded in 24 hours. And now after multiple call to the sale person and manager(who answers calls as per the mood) it's been a month I have not received my money yet.