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Did you 'upgrade' to the new level or did you just get them to move you to a higher plan.
It all depends on how it was done. If you 'upgraded' then you most probably would have been recontracted for another contract term. Otherwise if you just got your plan increased to the higher one you should not have been recontracted.
You do not need to recontract to change your plan.
If you contact Telstra they can tell you what the start & end dates of your contract are.
Hope this helps.