Heat Resistant Glass Sealant - 310ml Stock Number: ES914819

My Hotpoint BS61 glass oven door has come away from the metal brackets at the bottom. I have tried heavy duty epoxy but it did not work Will this stuff secure them back on or is the door Knackered. If So where can I get a replacement or can I claim it as not fit for purpost and make a claim as it is only a couple of years old and I would have expected it to last longer than this Please advise someone as wife complaining she cannot use the cooker and giving me eareache Thanks in Advance