Smeg Fridge Freezer FA550X?

Apparently both seals on the freezer and fridge need replacing. The seal on the fridge has buckled and there is hardly any contact on the freezer despite numerous times cleaning seal and defrosting . How do I replace the seals? I'm loathed to contact SMEG again due to their appalling service and exorbitant prices. I waited 9 months to receive a filter for my SMEG cooker hood....cost a fortune.....no apology/recompense. Truly shoddy. Manner maketh man! SMEG are sorely lacking....Italian fur and no knickers!