Panasonic — I am complaining about your worst service center in varanasi for mobile

Address:

Varanasi, Uttar Pradesh, 221003

Sir/madam,
When i submitted my mobile on 17/07/2016 at your varanasi service center which is located at bc tower at sigra they submitted my mobile and say that they will call me after mobile serviced but after about 15 days they make not a call to me they only send me message that your mobile has been serviced when i reached the center next morning they told me that your mobile has been again got damaged by their worker and then said me that to come again next 10 to 15 days to collect mobile, after 10 days when i reached to get knowledge of my mobile they told me that your mobile is unwarranted and it will get cost you about 5000 thousands for you mobile repairing,
Sir/madam,
Please clear me if my mobile in warranty period then how they are saying that my mobile is out of warranty and they make my mobile dead and changed the all parts of my mobile as well battery also,
Sir/madam,
They are not listening me
Please please help me