How can I fix my Hinari Microwave?

We have a Hinari MX 903 CRG Microwave approx 3-4 years old. The bulb has blown (ok needs replacing) place something inside to heat up and push the button, the motor goes and the turntable goes round BUT... it does not heat up.

I have 2 quotes for someone to come out and have a look, Q1. call out free but the first 1/2 hour 55 pounds + parts + vat. Q2. Free call out first 1/2 hour 42pounds + parts + vat. AAAHHHHHHH !!!!!!!

Help required here please

Jinx