I've been through similar situation,
First thing to do is to mail hdfc customer care regarding family banking and get a SR number
After that you'll get a call from your RM/BM
Then wait for 10 days and mail to grievance redressal then wait for their reply again wait for 10-12 days then mail to priority redressal then once 30 days are completed from the first mail.
Mail to RBI ombudsman and ask for compensation as well
Yeah, something similar happened to me since September 1st week. I submitted a consent form for an upgrade to the preferred status. I anticipated it would take around 7 to 10 days. However, it wasn't upgraded. When I inquired about the status, my relationship manager provided vague and frustrating reasons. Luckily, I had taken a picture of the consent form while submitting it to him. After a month, I contacted customer care for an update, and to my surprise, they hadn't attempted to upgrade the account. I immediately escalated the issue via email, attaching the pictures and criticizing their services. They initiated a case against the branch, and soon after, the branch manager contacted me, assuring that they had upgraded my account. However, even after a month, it remained unchanged. I directly contacted the grievance cell, providing call recordings, emails, and proof that cases were closed without my knowledge. They requested positive reviews in response to their emails. Eventually, they claimed my account was assigned to a VRM who wasn't ready to release it. I obtained the VRM branch manager's number and confronted him, leading to calls between branches to release and approve the request. But even now, they blame the VRM branch manager, stating that he hasn't approved the request after a month. After repeated calls, expressing my confusion about their procedures, Today I was finally upgraded to preferred, but only two accounts were upgraded, not my mother's account. I still need to follow up with them regarding my mother's account.
In this mess I tried to open an account in Indusind Bank and gave IP cheque of 2L from this account. I think they have observed this as well.
Just for one upgrade request, they took nearly 4 months. Hats off to HDFC Bank for the worst experience. Initially, I was delighted with the service because of the RM, all requests were swiftly handled. I used to offer FDs frequently to help him meet his targets. However, whenever he mentioned the guaranteed scheme, I always declined. FDs were my emergency funds, and I wasn't concerned about returns.