ISP switches are usually easy. You arrange this with the ISP, checking first if there are any penalties, then you locate another ISP that uses the same DSL carrier, and get them to arrange the switch-over. If your new ISP uses a different DSL carrier, you have to treat this as a complete termination and restart.
Your old ISP usually has to process a release form of some kind, which can be difficult to get if they are uninterested in being helpful.

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