Visa automatically void ??????

earthlover123

Registered Users (C)
we have applied for B2 extension before it expires but we have 5 years visa .
But we have not got any decision from USCIS .
If we wait for decision even after time allowed to stay ,
will 5 years visa void automatically ?
If we choose to leave US after 15 days , and wanna to come back in the same 5 years visa ,
will USCIS deny US to enter US ?
Please help
 
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