So the OP put only £100 to play at "high stakes"... well, high stakes to me would infer at least 5 quid a spin. So this is odd - no one plays "high stakes" with a deposit only big enough for 20 or so spins.
Then they point blank refuse to say what games they played - which is really odd as slots are (
@snorky510238 would disagree) random, and it would make no difference if you told us or not. And then if seems they get extremely irate at people who, legitimately, are asking questions.
Those two things together lead me (possibly wrongly) to believe something is not necessarily 100% right here.
They are on a forum trying to ask for help, and you (wrongly in my opinion) wont say what stakes or what games. Two things that actually could make a difference to your case (depending on the exact situation).
So rather than getting angry with people, the OP would be better just being open and honest. We cannot gain anything by knowing the information, but it may be that the information helps people answer you better...
They say you are bonus banned, so (as far as we know) it cannot be for bonus abuse. However, bonus abuse would be one reason to stall this long (to check) but normally a delay of this long means they are waiting for a games provider to check something...