SMEG oven door glass keeps coming off

Our SMEG OVEN glass shattered straight out of the oven door all over our kitchen when i was about 2 years old.

We got in touch with Roger who replaced it for quite some cost. Roger was a SMEG repairer working for SMEG.

We then called Roger last week. The glass had come off again (not shattered). And he charged us R650 for a call out fee to just give a quote on work he had done.

Now, we called SMEG to find out he no longer works for SMEG. And SMEG have taken over 1 week to get back to us.

And still no reply after chasing them up.

SMEG, what mus we do to have an oven door that does not break and come off. The rubber connectors ( a type of glue) doesn't seem to hold.

Please can someone help us.