I'm not arguing with you on one thing. If you're not happy with the service you're getting find another source.
The drawback is however that you will most likely NEVER find a source without faults. Expecting a source to kiss your ass and serve you to your expectations no matter how unreasonable those expectations might be will leave you sourceless. It's an illegal drug ring, there is no code of ethics or customer service guidelines. You're responsible for protecting yourself, making sure you have everything you need before hand, testing the quality of whatever you're using before use. Testing yourself etc and even then what you're doing is still very dangerous and the person/people who sold you what they sold you might give a fuck less about your actual health but more about the reputation of their "business" and rather or not you will spill the beans on your death bed(god forbid) and they end up making headlines. That's the best form of "customer service" you can get when dealing with this type of shit. That's as good as it gets.
Cliff notes: Don't expect people selling illegal shit to feel pressured into caving into your demands, and if they do don't think it's for the right reasons. Being respectful and treating the people you speak to like human beings is not only the right thing to do but it will take you a lot farther in recieveing "customer service" than threatening to stop buying and them quickly forgetting you existed. In this game consumers are the b side never forget that.