Saliha Hello! There is nothing on their user agreement page that explicitly requires you to deposit any amount to verify yourself. The only thing I could find was this:
4.16 If registration term of User's account is less then 1 month, and he received more than 15 BTC or the same value in other currencies - he should buy VIP account. Until he make this purchasing his account should be limited in withdrawing. Usual price of VIP account is 0.5 BTC or the same value in other currencies.
I am pretty sure a 14-year old wrote this clause. They forget that 0.5 BTC equals $18,000+ (according to the current market price). I don't think anyone in their right mind will be willing to pay $18,000 for a VIP account. This is absurd! 😆
The best part about their user agreement page is that they added few lines to justify what they are doing is legal and other than that it is mostly generated content. You should have checked this and asked them questions before depositing any money.
By the way, what amount of BTC did you receive or deposit in total? Since you clearly did not agree to any part where you are required to deposit to verify yourself, you can scare them by faking to take legal action. They have already made their information public so I am sure they will be forced to comply. Just don't mention the part that you are from Pakistan, and you will be good to go.
I am quoting the company's information which I found on their main website:
Profex House, 25-27 School Lane, Bushey, United Kingdom, WD23 1SS
Company Number 11142206
Also, I am not a lawyer. I am only giving you my opinion. You should contact a professional and ask them how to deal with this if the amount is worth the trouble.