I can assure you that its far far easier to piss off a western salesman than one in China.
Never worked with Chinese salesmen or buyers, really.
Do you really think that asking a Chinese test equipment maker if they are aware of people like Siglent and Rigol is a way to start a conversation?
But I do work with American buyers, and they often start the conversation with "Manufacturer XXX has this feature set at this price, what do you have to offer?"
In general, I would leave them alone, if they don't want to sell scopes outside of China. It is not like there is something unique about them.