I was probably to lazy to look at such things but to tell the truth now I feel really kind of stupid that for years I simply paid way too much. I have a payment terminal at work and I paid a monthly rent of 70.- CHF. I had the same machine since 2014.... Means I paid a rent of 10'000 CHF and now they offered me to buy a new one for 1'000 CHF... without monthly rent. They made a good business at my expenses...
I've realized that the more complex a contract, like a credit card agreement, the more they cheat you. Because they know it's not so easy to get a new one.

Now I told them that they need to provide me better fees because what I paid so far was not market level. And they reduced them by 20%... It's so easy when you ask...