I know that we English are known for our preciseness, but I do feel so sorry for Roger. He answers never ending queries about the product, to the very best of his ability. He does not profess to be the guru of all things Tunze, but is working hard to make sure we all get the very best from their product. He does his best. That is all we can ask.
People are far too eager to blame someone else when things don't go their way.
And it really is NOT going your way.
If they are too stong, sell them!! Simple. Why put yourself and Roger, through all this, when it is a case of making a decision. If you FEEL misled, then a public forum is not the place to air your dirty washing. Put it in writing to the company, and try and get some recompense that way.
As it is, you just seem to be trying to out-do Roger, who is only doing his best to help.
It is, sadly, yourself, and not Tunze that is looking poor here. Take a deep breath, and resolve it in another way. Arguing in public is embarrasing for Roger, and humiliating for you. You have had not one note of support here.
Sorry. Couldn't just leave it any longer!!