Dear Faizan
No a days it is the general practice of most of the organizations to give threat of termination for non performing sales employees.
As the word termination has very powerful impact, thus employee resigned by them self under pressure & worry of getting terminated.
None of the organization can terminate an employee on immediate basis because of non performance untill & unless they have given you enough chance in writing (PIP) to improve your performance. Once you failed to improve during the PIP then company may terminate your services on ground of poor performance.
As they have given you fair chance to improve your performance.
You can speak with the HR of your company & tell them to provide you chance for improvement, which can be monitored on monthly basis at least for 60 days.
My advice to you will be do not get in to the pressure & trust me they will not be able you to terminate from the employment, if they do so then they have face legal complications.
Also to give you more clarity & support if your company go with the termination then they have to clear your due within the two days of your termination, as per the Shop & Establishment Act of Telangana.
So do not get in to the undue pressure just perform well, our wishes are with you.