RA Disinvestment

I received notification to dis-invest my Retirement Annuity I have with Old Mutual, I confirmed that I wanted to dis-invest, I received no feedback. I called in, spoke to someone who rep**** by email, they asked me to complete documents which I did, and supp**** documents they required from me. I emailed the documents through to the email address supp****. I received no feedback. I sent an email asking for feedback or an update... NO Reply. I then resent another mail asking again for an update or feedback... NO Response. I have tried a number of times to phone the specified number, I go through the menu to be told that they are unable to assist and that I must try again later??? This is being going on since the 2nd March 2023... 3 1/2 months, how long does it take to answer to a query?