Lenovo — lenovo smartphone (a7000a)-touch screen non functional issue

Address:	Gautam Buddh Nagar, Uttar Pradesh, 201301
Website:	robotelindia.com

I handedover mobile set (A-7000a) on 28/12/2017 at robotel teleservices pvt. Ltd. (Lenovo authorised), n-24, pocket-k, near dr. Lal path lab, sector-18, noida (Up)-201301 as touch screen was not working. The contact no. Of this center is -[protected]. Accordingly, service job sheet sr. No.-479, dt.: 28/12/2017 issued. I followed on 04/01/2018 but it was informed that service part is in shortage & service center is expediting.
Again on 06/01/2018 same response received.
On 09/01/2018 i again enquired and same response received. I asked them to return my set as the same part is available in other service centres as i enquired and i no more interested to get it repaired through this center. But they refused to handover and on further persistent request they demanded to charge rs. 300/- as service charges without repairing the mobile set which i refused.
Finally they have not handed over the set nor attempting to repair it.
The services of this center is very doubtful, please take strict action against this center & blacklist them. Also inform me the exact cost of touch screen replacement parts as the estimated cost of rs. 3800/- given to me on 28/12/2017 by this center is also on higher side as i enquired.