Lenovo — lenovo k6

The mobile lost sound within 6 months of purchase. The nearest authorised service centre at mecheda reinstalled software & said that problem solved. But sound did not come back. One month later an authorised service centre at behala said as service has already been done in mecheda next service will be available in february 2018.
If problem is not solved what is the the value of servicing?
What is the value of warranty? Mobile is out of order. No solution done. Why to delay with defective mobile? Is it the reputation of the company? They should be banned. All should reject the company.
Being a doctor it is requested to imagine the loss related to patient's life due to non-functioning of mobile. Will the company compensate for the lives of patient.
The company should be sued against.
If no action taken all should go for consumers protection forum for immediate replacement of fund with taking back of such wonderful mobile or ban such bonafied service centre. They should stop sell. The company should be banned, for this cheating in large scale as found in complaint forum..