Bigbasket.com — no service

Big basket makes deliveries to my neighbour, but I have not got a time slot the whole month. When I open the app it say time slots available, but when I check out, it says no time slots available.
I called the helpline on 11th April at 11.08 am. I was assured that my deposit would be refunded in 7 to 10 working days. That has not happened.
I do not want to waste time and make myself frustrated with bad service. So kindly refund my Rs.5000 immediately. You are keeping my money and giving me only irritation in return.
My phone number is [protected].
Sheila Mascarenhas