If you ordered some brown sugar, and the brown sugar was not that you had in mind , and you phone them.
The sequence of defences will be :
a) We never sold you any brown sugar - supply details of order
b) "Yes we sold you brown sugar" repeated as though they were informing you of something.
c) Stonewall denial. We did not send to you the wrong thing. We sent you brown sugar. Expect a repetition of (b) followed a repetition of what you already told them - as though you are stupid.
d) I have here the packaging and the details including the delivery receipt.
e) "They must have delivered your package to someone else" (ie delivery company's fault)
f) "If not, then you must have ordered the wrong thing". Jump to (a)
g) "Bitte ? I am not understanding you" (and your valid discrediting of my BS that I am feeding you)
h) "Still not understanding you." Brrrrrrrrrrrrrrrr. Dial tone.
My advice is :
a) Keep copies of everything and do everything in writing or email. Phone doesn't not count.
b) Send copies to company directors and pretend you have sent it to Meier & Meier Rechtsanwalt by indicating them in copy.
c) A week letter send another one with all the email/letter trail attached expressing your disgust at their lack of response.
Start from the assumption that the company is stupid and doesn't care. Then you will not be disappointed.
I once had a long telephone arguement with a woman representing an well-known insurance company who could not understand why I needed to know my new quote for the forthcoming years insurance before it was too late to cancel the policy.
Whether you are prepared to fight-the-fight or simply vote with your feet and go elsewhere is up to you. Don't be surprised if you are expected not just to tolerate incompetence but to pay for rectification .
Like so many things in Switzerland this kind of crap service prevails through lack of competition, and if I could have one wish (other than Dougal's Breakfast spent time reading and less time posting) it would be that swiss industry received a serious wakeup call.
AYB