[Resolved]  Byju's — wrong product

I had placed an order with bjyu's for study materials of 10th. They delivered the tab with 7th std materials. Now i find that i do not have an order id, nor is my mobile number or email id registered with them. I am not able to get any positive replies from the various persons that i spoke with. But all i have in hand is a tab with 7th standard materials which is actually of no use for my son who is in 9th cbse. I would appreciate if anyone could help me in getting this sorted out.