bittersweet
You should have had confirmation within 14 days of them receiving your GL24, so it is worth you contacting them.
They should accept a phone call from someone else if you are available to answer the security questions and authorise them to speak to your companion.
If this is still beyond you, then the only other thing is for you to write to your local DWP office, asking them to confirm receipt.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems