I don't think it is too much to ask for folk to know the products they sell. If it was one of the first ever, before the TSBs were released, it would be understandable. Mahindra had the issue identified and corrected on the new builds starting sometime in 2013. Dealers should have been up to speed by the end of 2014. Halfway through 2015, I consider it very unprofessional for a dealer to not know of the issue. Beyond that, to simply tell the customer they don't know what they are doing without some sort of instruction or resolution is also very unprofessional.
I spend a great deal of my personal time studying the products and services I provide to my customers. Lawyers have to keep up to date with changing laws (ignorance isn't a defense). Doctors have to learn about the new procedures and medicines as they come out. Techs at auto dealerships are sent to training to learn the new systems the latest models ship with. It really isn't too much to ask for a tech to be properly trained and up to date on the items they service, and it's not unreasonable to expect.
If the "tech" that did the "full service" in the scenario above hadn't learned the TSBs and stuff for that model, stuff that is needed to do his job, and further failed at that job by not specifically checking the TSBs on a model in his shop before sending it out, he's not much of a tech and I think MUSA needs made aware...
A couple new starters here and there is much cheaper than a bad reputation caused by dealer techs not knowing the machines in their shops and rushing through services without checking TSBs. I think if brought to MUSA's attention, they'll gladly deal with it...