Shocking customer service

Went in to exchange my 9 km gas bottle for a refill and was advised that they do not exchange cadac bottles which I accept, however I received the bottle from them last year. I stay 2 km away from Engen and only use them to refill my gas. Patrick called me a **** and refused to provide me with his superior's contact details. I refused to leave without my gas and eventually got hold of the owner who also told me to get lost. I will never use Engen again after the treatment I received and I would urge everyone I know to do the same. Shocking treatment!