Is this not a rip off

Holding deposite I’m fuming they just keep it n I will never pay one again 200 for nothing

Email FAQs | OpenRent
You can take legal action on and claim your money back through the court in addition to your legal expense.
You can also take legal action against the person with your holding deposit and win your case.
Estate agents have been sued successfully.

Did you put one down through openrent? Unless you’ve been dishonest or refuse to work with the landlord you’ll get it refunded by Openrent.