Several reasons, it depends on your technology.
If the Speed was capped, they need to push a new firmware on your router and also “validate” you on their system. This take time to do.
If you are switching technology, let Say from an Adsl to a Vdsl, they need to actually send a guy that change where your phone line is attached.
(And probably you need a new router, but idk, maybe nowaday all the adsl router are also vdsl)
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