ICICI taking 3+ weeks to link my new HUF account to netbanking — what's my next step?

Opened a HUF account with ICICI recently. Account itself was opened in ~10 days, but since my mobile number is already registered with my existing savings account, I got this SMS:

"Internet and Mobile Banking cannot be enabled in your ICICI Bank Acc XX467 as your mobile no. is regd. with another Acc. Visit any Branch for assistance"

Fair enough — visited the branch and submitted the linking form on 19th June (the branch guy had apparently been working on it since 13th June). I hold a privilege account, so I also escalated to my RM, who looped in the deputy branch manager. DBM called me herself and promised it'd be done by 4th July.

It's 8th July. Still can't access the HUF account on iMobile. Nothing has moved.

I've got 4 credit cards with ICICI too, so it's not like I'm a nobody customer to them.

Has anyone dealt with this HUF + same mobile number linking issue? Is there an internal escalation that actually works (nodal officer? principal nodal officer email?), or do I just go straight to the RBI Ombudsman at this point?

Note: Used AI to summarize