Zerodha — Zerodha is not closing my demat account even after 20 days of receipt of my signed physical Account closure form

Address:

Zerodha, No 153/154 4th Cross Dollars Colony, Opp Clarence Public School, J.P Nagar 4th Phase, Banglore - 560078.

I have Demat account with zerodha, i wish to close my account, .
I sold my shares, then zerodha deducted their due's, so i transfered the remaining balance to my bank a/c.

Then, i downloaded Account Closure form from zerodha website. filled, signed & sent to Zerodha HQ in Banglore thru Professional courier on 1/July/2021.

On 2/july/2021, i received a sms stating, received your application, will close your account in 5-7 working days.

Today date is 20/July/2021, still not my demat account is active.

i called support 4 times, whenever i asked about account closure, the executive is saying, "It will be closed by end of today".

I raised few tickets too, but no response from zerodha.

but nothing is happeneing.

Friends, my kind request is, dont deal with zerodha.