I went to a doctor in Geneva a few months ago (I work & live in Geneva for a few years now) and, as per usual, I received the bill about a month later and payed it immediatelly . I even made a claim to my private insurance and got back some of the money I paid for the doctor's visit.
Here is the problem now: I got today a letter, stating that the bill is not payed and that I should pay it immediately (plus a surcharge of CHF 5.-) from the union of doctors (not sure if I should include the name of the company in my post) altough I have already paid it.
I send them and email (in english) and got no response.
I have available at any time the proof from my bank account that the bill was payed through e-banking and the proof that my insurance paid for that specific doctor's visit.
What should I do? Should I contact them, the doctor or my insurance company? I don't want to give them free money, nor get into any legal troubles.
Thank you in advance