Problem will billing

In error i signed up for a yearly paramount plus subscription.must say i did not realize i did it because i already have a free subscription with Xfinity 

i went into local office and they said to contact Paramount which i did. Paramount said there is nothing to do with this and to contact Xfinity. I showed the paramount text to manager at local store in Germantown Tn and while she was very nice after 20-30 minutes she said i could cancel but the subscription would stay in place until it expires next year.

help