So why don't you just do what they asked you to? That will almost certainly be easier than disagreeing with the IO about what should be done.
If you really did cancel it you should have a letter so stating and a stamp in your PP showing it was cancelled. Do you have those things?
those are very standard windows sold commonly in construction suppliey shops. Go out and check out new prices and that will give you a good indication of what you might get for them used.
only????
I do not link my cards, choose safety or convenience.
You can check Lazada and Shopee purchases via their websites. Don't know about the others, don't use them.