Quoted $80 Go5G Plus

I signed up for t-mobile in store and the rep told me two lines of Go5G Plus would be $80. When the bill comes lo and behold I was charged $110 for the plan. Phone support said there’s nothing that can be done and the rep couldn’t have quoted that price. Is there anything I can do? Very unhappy with t-mobile, they also added protection 360 when I explicitly denied coverage.