Lenovo — to send the proper material to fix the problem of lenovo miix 310

I have purchased lenovo idea pad mix 310 in of 2017.but after 4 Month it's keyboard and touch is nt working properly...the product is in warranty..so i submit to a lenovo service center of Behala, Kolkata named Anand international in.07-10-17 and my so no is LBGL[protected]..manufacturers serial no is-YE00P556..but after 1 month they can't fix the problem..they r saying that lenovo company is nt giving their required material to fix the prblm and they r saying they don't know which time my tab will be delivered..i also attached proper documents with it.so i reqst u to take proper action..otherwise i hv to go consumers forum.