Unwanted billing for undesired subscription

Hi everyone,

I was checking the invoice and in “Verbindungen & Services ” section appears an unjustfied amount of money, because I did not subscribe any service. Indeed, I cannot find any subscription on the O2 app or site. (I also checked the instruction at the following discussion  Abofalle, was tun? | O₂ Community ).

However checking an old cell message, it seems that I subscribed some “Unlimited o2 games”, which I am 100% sure never did. And this explain from that date why my bill increased. For this month there is an additional increasing of money in the same parameter of  “ Verbindungen & Services” and still I cannot see anything.

I really want to unsubscribe whatever the system did. There is some mod or someone to contact in order to solve this issue?

Thanks for helping.