Wren, unprofessional? - to borrow a term from our cousins over the pond: BALDERDASH!
In many years of dealing with Wren (from a plans built to the 160 this year) neither Mike et.al. in England, nor Ron in the US have been anything other than professional, and fair. Many companies charge, charge, and then charge again - and yes, Wren charges, but EVERY bill I have had from them has been extremely fair, and their service has been incredibly prompt. Me thinks there is more to your story than you are disclosing.
Greg
Just another satisfied Wren customer.