Redbus — cancellation charge still not refund in my account

I booked my bus ticket from karur to chennai on may 5 2020 ..ticket number is TP5K48821472 ..It was cancelled due to covid 19 on april 21 ..they told the amount is credited within 5 bank working days ..but still the amount not refund in my account ...the bus ticket amount is Rs.420.Please refund the amount as soon as possible. .
Thank you