My diploma thesis supervisor was ignoring me for 99% of my diploma thesis writing and even bailed on me and did not come to the defense. I graduated with distinction and I want to apply for PhD. However, my supervisor ignores me again when I am asking him to give me a recommendation for PhD to TUM. It is a classic situation for him, apparently: many students reported the same problem.
What would be the best solution? Should I try to "catch" him at campus despite him ignoring my emails? Should I instead ask my bachelor project supervisor (far less famous researcher, however)? Should I instead ask for a recommendation someone from my actual job (also a PhD but different field)?
What would be the best decision in this situation? Maybe someone has an insight specific to TUM? Would it be weird that from two recommendation letters I'll send none will be from my diploma supervisor despite me graduating with distinction? Should I explicitly explain why I did not have recommendation from my supervisor in my application?