@Orangeblossom78 Ah, well now I'm with you. Yes unfortunately that's the fatal flaw of endowments. Sorry I'm afraid there's not much dressing it up. But, try this:
I would speak to your provider. I would ask them if you could remain in the fund and delay a payout. Be proactive. Tell them you know that this is not a good time to take your money out and you are prepared to wait (assuming that is viable). You may need to escalate this and I would not expect to get much joy from your call to a call centre, but I MAY be wrong on that. If you get told 'sorry nothing we can do', you need to raise this as a formal complaint. Ask them for their complaints procedure to be emailed to you, make sure you tell them on the phone that this is now a complaint. They HAVE to act.
Your complaint is that they knowingly, despite your request, are going to encash an investment and disadvantage you. They are therefore not treating you fairly as a customer (they are required to do so by the FCA regulations). You must tell them you are prepared to wait and perhaps offer a minimum period of 1 year to extend the contract or leave it 'paid up'. See what they say.
I can't promise it will work, but I feel that the fact that there was a huge scandal attached to endowments, tell them that you've taken advice and rather than complain (why haven't you?), you wish for them to remove the barrier to a successful outcome which is this automatic encashment.
I'd be tempted to Tweet them - "why when I've pointed out the issue with the auto encashment of my investment are you refusing to intervene?!" - someone will be on to it sharpish.
Perhaps follow up with
"Another example of big investment companies kicking the little investor when the chips are down - I've asked you not to encash my investment - computer says 'no', and you don't care"
Make some noise... might be worth a few grand!
If you want to call them and then message me, I'll give you a steer. Good luck