Terrible Service

I changed jobs at the end of March and requested to withdraw my pension funds upon leaving. April comes around and I get an email from Momentum welcoming me to the Fund scheme and informing me that my employer (who I have now left) has chosen momentum for our work benefits etc. I've emailed them informing them that I have left this employer and requested my funds to be withdrawn. It's been two weeks, I've sent two emails and I still haven't received a response.

I see from the benefit statement that, despite my request and informing them multiple times that I'd left that employer at the end of March, the funds have STILL not been withdrawn.

Ridiculous that a person cannot even get a response to multiple emails.