Down with Dial Direct

I took out a warranty cover on a month to month basis. When my vehicle engine warning light came on I telephoned and emailed diall direct. They asked me to take the vehicle for assessment snd that Mercedes will contact them before work is carried out. I am now sitting with over R7000 bill. My concern is the R2000 odd I was charged for the assessment related fee. I accept and have paid for parts not covered for in this policy. This is totally, totally unfair.