Okay, thanx one and all for the suggestions (and comments that were off topic too).
@Kenny **********
as you might have gleaned from the replies (or not) it is YOUR responsibility (seeing as it's your passport) to go get the stamp corrected. You should have done it when you filed your TM30 the other day.
I think you know by now that the stamp is wrong, that you only really get stamped in until 20th Nov 2019 and staying after that will be overstay.
Good Luck