Well depends on them, so be careful. The statutory cooling off period for buying goods and services on line is iffy on these matters as it is not meant as a "free trial of a service", but a period in which to "change your mind before before getting a service". For goods it is a "change your mind after getting it", if you send good back, but not for services (as you can't send them back). So depends on their contract - you may find there are charges. So check.
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^RevK