RE: Help/Advice please6 Jan 2021 17:12
" I always thought a CFD retail client has negative balance protection." - I always thought the opposite (better safe than sorry!). You'll probably have to read your Ts and Cs, as you ticked a box saying you understood and agreed to them, and knew the risks of investing.
Worst case, I assume you'll get a bill. Then it'll be up to you how much of your ISA / shares you cash in to pay it. If you don't pay the bill, legal action. I doubt they can hold it as collateral, unless that's what you agreed to?