I want to add more few points :-
1) So, deputation period is cancelled.
2) Deputation has been started from July. So, from July to present,this period will be with out pay and regards as break of service. Who will condone this break ?
3) The resignation should be submit to the concerned college, because the release order once given from school. So the school can not accept the resignation.
4) In such case the service continuation may not be availed by the candidate.
5) In fact, if any one do so, then he may start his service from the very beginning.