Lenovo — plz give solution & solve my problem

Address:

Hassan, Karnataka, 573116

Dear sir
I have purchased lenovo zuk z2 mobile in november 2017. After 4 months of purchasing display was off and not on mobile. Then i submit my phone in service center lenovo motorala service center in hassan, karnataka, india.
In that service center the behaviour of staff is very odd. After 45 days of submitting phone they are saying my lenovo service ceter was cancelled, collect ur phone and consult another service center.
Im already 45 days are wait for mobile repair but mobile are not repaired are returned. Plz solve my problem and plz repair or give another mobile or refund my ammount.