door sill

Hi all Just sticking some bits and pieces to van and one door sill hasn't stuck very well. The bottom is ok but top (either side) not very good, can anyone suggest best way to secure down as don't want to buy anything that might make hard to remove at later date if required Thanks

I’ve read the thread on this about having them replaced under warranty but mine have only just started to go and it’s well out of warranty. Is it a feasible DIY job and if not, how much has it cost anyone to have a garage do it?

Whilst cleaning the interior I noticed that the door rubber was not sitting properly along the drivers footwell. On folding back the rubber I have uncovered rust and quite it looks like it's got a bit of a hold. Will be returning to VW tomorrow. It really is a pain in the ass as it's been back...