Current OOS process

What is current OOS process and when resampling is required and when not required

Please refer current USFDA guidelines on Investigation of OOS Laboratory results.
Resampling should be done only if it is proved during investigation that the initial sample was not representative of the bulk product from where it was sampled.

If the initial sample was exhausted / contaminated or deviation noticed in sample collection, Resample can be collect after taken approval from QA.

Yes, you can do that provided there is a sound scientific justifiaction and approval by QA. You may have to perform thorough investigation to demonstrate contamination or deviation noticed in sample collection.