LPG gas regulator?

I know its dangerous to use a leaking regulator leaks at bottle fitting. A manager of a roofing material and hire shop supplies thinks I'm expecting too much after he was forced to change two new that leaked, wasn't prepare to check the bottle I had although I had on my caravan regulator and no sign of leaking. My thoughts are over machined mushroom head seal end that fits into the bottle. Should I have reported his attitude to head office as someone couldn't accidently ignite the escaping gas and who knows what would occur.