You need to soak the opposite end of the pin in wd40 and brake cleaner. I use a punch with a centre drill hole in the middle and you need a big hammer and one big hit. There is like a spring collar on the inside side that keeps the pin in. After you have soaked that, they usually come out first bat. The hole in the punch means the punch locates on the taper pin, 1 it doesn't slip off and chip the paint on the caliper, and 2. It stops you flattening the end of the pin as you have. Also, it sometimes helps tapping the pin from the other side to loosen the retaining collars. You can get a full set of pins from Eurocarparts for £15, not listed online but they stock them. As for the pads, you can buy Ferodo pads for £20 for Brembos but they are made of cardboard, as are your Mintex ones. Good pads are £100, as said get some from Renault, you will not be disappointed and it will be cheaper in the long run. The standard pads are very good value and very good performance and about £60 with discount I think. Oh and buy yourself a couple of cans of brake cleaner