Tandem — There is no ISI MARK on the tandem pressure cooker

Address:

vishal mega mart , dwarka mor branch , new delhi - 110059

Today (26/12/2020) i bought pressure cooker of tandem 3ltr from vishal mega mart, dwarka mor branch, new delhi - 110059.
my issue is that there is no ISI MARK on cooker which i bought, even there is no ISI mark on most of the tandem cooker & electric kettle of the same company .even when i asked manager of the mega mart regarding ISI MARK - he was said " lena h to lo warna chod do koi or le lo " but he can"t able to answer my question.

i got disappointment by vishal mega mart while shopping

what can i do in such case when cooker may brust while working on them ???
who will taken resposnbity in this case..???

i am attaching photos of cooker along with original bill .

pls enquiry for the same issue to the vishal mega mart. ( phn no -[protected])

i want answer of my question as soon as possible