The visa can be cancelled at any time with various reasons.
generally with remark " Cancelled without Prejudice".
The visa cancellation is not very serious pertaining to intention of the applicant.
It can further be approved after correction whatsoever in application i.e. information & documents. Nonetheless, it is not so easy to "overturned" decision of cancellation of visa.
Visa can also be cancelled by issuing authority in case an applicant has given information which is not pertaining to reason to category which applicant has applied with.
Visa is issued with issue date and expiry date following with associated basic terms & conditions.
Further considered at the immigration check at entry clearance point. If immigration officer is not satisfied at any point of time with an applicant's profile and reason, Visa can be cancelled before it expires.
After visa gets cancel next step is to reapply of visa and depend on facts & circumstances associated with reason of cancellation.