cant change my plan after my contract ended

Trying to change my plan and every-time I do it keeps coming up with an error message. My contract has already ended so want to get this sorted so I’m not over paying for my data and minutes.

Trying to change my plan and every-time I do it keeps coming up with an error message. My contract has already ended so want to get this sorted so I’m not over paying for my data and minutes.
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