I sent my I-765 application for H4 EAD renewal on March 4th,2020 to Phoenix lockbox but I have not received any receipt notice yet. I called USCIS and they said they couldn’t find it in the system and asked me to email the lockbox, which I did but they will reply in next 30 business days. Since it’s been already 22 days, can I resend the application ( after cancelling the cheque of previous application) or wait for few more days?
It is your choice now if you want to resend a new application or not. Note that if USCIS has received your previous application, they will try to cash the check.
Adding stop check is not a good idea as it is for government service. USCIS will send an RFE or deny your H4 EAD if the check bounces.