Its been impossible to switch to new plan after contract end

I’m left to only assume that I’m being held hostage to a silly expensive contract rate after the contract has expired. All because iD is vested in making it impossible to self serve, with the single intent to keep charging a very high rates!
 

I’ve tried time and time again to switch both via app or web and all I get is a ‘Oops’ message! This is not good conduct!