something about opt out so my bill dont go up

I tried to reach customer service today 10/16/23 so I can opt out - I don't want my bill do go up.  I don't want to accept this new plan.  I was not notified by T-Mobile.  A friend sent me information about waiting for 4 hours on the line to speak to a T-Mobile Agent to request OPT-OUT.  But today I've tried several times this morning and when the recording comes on , it automatically disconnect the call so I want to OPT-OUT all phone and devise lines associated with my bill but there is on way to speak to an agent and I understand the OPT-OUT has to be given to T-Mobile before the 17th.  Can somebody from T-Mobile respond and advise that they received my OPT-OUT request please.