Contract Renewal not gone through

On the 5th of October I renewed my contract via the app at a new cost of £73.76 a month on a 24 month plan.

My latest bill has come through today for over £100 (almost £20 up from last month) and according to the app I am still showing as up for renewal but now at £75.15 a month.

I have no idea why the first contract renewal hasn't gone through, no idea why the latest bill is so high and no idea why I'm still being offered another renewal at a higher price.