Bad service from HR

I have been an employee for metropolitan for about a year, I handed in my resignation around second week of june, submitted the laptop it was checked and there was not fault, went to my line manager so he could sign my withdrawal claim for so that I can send it through to momentum funds at work, after I left the office I took it upon myself to submit everything to momentum funds at work so that they can process the claim and I received an automated reply stating that it takes about 26 working days to process the claim, we are on the second week of week of July momentum funds at work has been informing me to speak to Metropolitan HR so that they can remove me from their system so that they can process the claim, I have sent tons of emails to Hr to no response and also to the receptionist at metropolitan Ghandi square office till today no one is responding to my emails it's a bluetick can I please be assisted so that funds at work a can process the claim