Some mage Rejected due to similar Content and Some for low quality

You can't create mages of trademarked or copyrighted subjects like Spider-Man. That would be a property violation. 

Size is not and has never been a quality property.

Similar content is probably the most difficult refusal to solve. It is recommended that you should check the titles and keywords so that they are more unique to the asset. 

Quality issues for vector assets normally are the result of bad vectorization and nonclosed elements. 

If you get IP refusals, that may be that you are using proprietary elements like logos or design elements (the red cross is one of the most common unsuspected IP refusals, the round iPhone button is an other one). There may be other elements that will not pass. We need to see the asset to check that.

We need to see the rejected assets. Post them here in the size submitted.