If the deputy has not resolved it, pick up the phone and call the head of HR.
Or better still if you are in the same office knock in and stand outside until you get face time.
Be focused on the failure to pay the salary and only that.
E.g.
"I know you may be aware that there are other issues.
However I am not going to discuss them now.
I have one issue I need you to deal with.
I am entitled to be paid X this month.
Your staff [ name ] has informed me I will be paid Y
Or
I was only paid Y
How are you going to resolve this as the company is not meeting it's contractual obligation."
Then stop talking and let her/him answer.
Once any mention of manager occurs or anything not about your pay you counter to close it down and go back to not being paid.
"I expect that you take responsibility as Head of HR
How are you going to resolve this as the company is not meeting it's contractual obligation."
"That issue is not relevant to me not being paid this month. I expect that you take responsibility ... contractual obligation."
Have some other stock phrases to shut down justifications for the managers interference.
A simple one is asking it the company has clear and documented lines of delegated authority.
Delegated authority comes from the owner/ board and gives staff the right to sign off on payments etc.
So the managers manager can sign off any document the manager can. And the head of HR would have authority to pay wages.
If there is "can HofHR explain how that applies to your salary payment?"
Then ask them to get X to sign off.
If there is not "who has the ultimate authority?"
Then ask them to get X to sign off.
Internal approval will have a hit by a bus safeguard which will be that HR and Finance can make a payment once they can prove it's not a fraudulent one.