Lenovo — mobile damaged. unable to read both sims

Address:

Patna, Bihar, 800001

I was using lte service in my mobile and had given my lenovo a7010a48 (White) mobile in the new tech. Auth. Lenovo service centre in patna on 16/08/2017 for converting it from lte to volte with all other features in well to do conditions. For that they told me that i would be charged rs. 240 and they asked me to come on 17/08/2017 evening to receive my phone. But when i went for the same my phone was unable to read any sim as it had been working earlier. When i complain to them first they told me that phone motherboard was damaged and i have to pay rs.7000 for this. And i refused to receive my phone as my phone was in well to do condition before submitting it to the service centre. I had not received my phone and it is with them. I wanted my phone as it was earlier. Please help me. Thank you.