@Graschennel42
If you have the TV X package you can change this in MySwisscom. if Netflix has not another valid payment method from yor side, then it should be sufficent, if they have, you have to cancel Netflix additionally as described here:
https://help.netflix.com/en/node/407
Take a look into the knowledge base.:
https://community.swisscom.ch/t5/TV-Knowledge-Base/Swisscom-blue-TV-Netflix-TV-X-What-you-need-to-know/ta-p/599265
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