Slab rates for cash purchases ?

Dear all, 

I find this message doing rounds in Whatsapp groups 

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Ask for seperate bills

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While shopping in Big Bazaar, GVK One, D-Mart, Spencers, Inorbit, Forum Sujana Mall, More, and other shopping malls pay attention to your billing...

Get every bill separate for every Rs. 1000/- because the GST slab breakdown is as follows:

0 to 1000 0% GST

1000 to 1500 2.5% GST

1500 to 2500 6% GST

2500 to 4500 18% GST

Please share with all your friends and family...

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How is this possible? As far as I understand, GST is a part of the cost for retail end user for every product / service. How can it be avoided ?

Thanks in advance

Regards,

Geetha