Flipkart — Iam complaining about flipkart not providing proper invoice of my laptop

I have purchased apple macbook air Apple MacBook Air Core i5 5th Gen - 8 GB/128 GB SSD, ordered date is[protected], i got an invoice copy to mail address which doesn't have serial number of this laptop, recently on 16th October i am facing charging issue of laptop so i took it to apple service center, then apple service center guys said this invoice is invalid it doesn't have serial number of laptop later i asked flipkart to give me correct invoice copy with serial number, they are not ready to give it they are extending date daily its been 3 days now but i didn't got corrected invoice, for this reason my salary is getting deducted daily
Please help me
Thanks