My mother had an '05 A180 CDI and now has an '09 A180 CDI... the first one gave no issues but the second was terrible... Even under maintenance plan you still have to pay (stepped maintenance plan) and parts pricing is excessively high even when compared to Audi or BMW in our experience
We used to use Mercedes-Benz Grand Central Motors in Midrand to service the car as that's where we bought the first one. They changed minor parts which weren't required to be changed etc... They wanted to replace the ignition key system for +7k which turned out to be a bad solder point by the relay system - an independent mechanic fixed it (the guy used to work for Merc)
On the second car, they changed parts after we refused the quote (seatbelt clip cover) and only after lots of fighting they gave us a discount for the parts... There was a clicking noise by the front left (after changing CVs and 95000km) and that took months and many replacement parts (at our cost) until it suddenly came right... The glow plug light turned on after the car was on for a few minutes - they replaced a glow plug and then it was constantly on. They then wanted to replace the glow plug control unit but we refused... The same mechanic found that a wire had been CUT (sabotaged) and he soldered that back together and no issues since. The car then went to Merc in Northcliff for a service and they said that Grand Central Motors had loosened bolts/screws on the car...
So while Merc Northcliff is better than out previous experience, this will be our last Merc
My recommendations:
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