You should email to helpdesk.en@ig.com or go to IG client Help on Twitter and leave a dm for them, they replied fast.
Calling them is waste of time, i tried it for 5 days in a row, morning and night, waiting for like 1 hour behind the phone and they keep saying we will be with you shortly, But note that it was cuz of the issue with the mt4 and now they have solved it so probably now they are more responsive. Cheers