Matrix Cellular International Services Pvt Ltd — Sold SIM on false promise

Hi, I took the matrix international SIM from delhi airport and sales person assured me that hand will support 4g and 3g for the internet.
When I landed in us now only calling features are working and internet is only supporting 2g internet.
When connect with the support person he said that your phone does not support the band for 4g or 3g.
I purchased my new phone last year only.
I payed 9000 for 3 months plan and now what no support
Complaint : sales person should have mentioned that phone might not support it. But he did not mentioned it and sold me sim on false terms. Plus I cannot change my plan and no refund also.
This is not right to sell your sim without full disclosure