High bills, I don't know why

I agreed to a contract with o2 for an unlimited tariff for €55 per month, however, every bill since then has been over €80. 

I am charged for Netflix which I did not ask for as well. 
 

I don’t use roaming, I don’t use premium services etc. and there’s no reason I should be charged so much. 
 

Also, on the app itself my last bills only show up to August (no bill layout for 4 months) 

Edit o2_Kathi 20.12.24 Moved from the section o2 Mobilfunk: Rechnung to English o2 Community: Mobile + Title adapted for a better overview