Poor service from Mercedes benz South Africa

I recently called Mercedes Benz South Africa head office to enquire about their airbag safety recall. I initially spoke to David about the process of checking how my vehicle qualifies for the safety recall because I had an airbag fault on my vehicle. The problem I have is that I have to book my vehicle at a Mercedes service Centre and if it's not the airbag I have to pay R2200 for a diagnostic check on my vehicle. Their team leader Portia even failed to call me regarding the said issue. Their brand is the best or nothing. In this case I think not. What a pathetic service from a top vehicle brand.