Intex Mobile / Intex Technologies — After 5 job sheets and three months my phone is still lying the service center

Address:

Gurgaon, Haryana, 122001

Hi. I purchased an intex aqua pride handset in october 2016. The android system got corrupt within two months. The phone was within the warranty period, so i submitted it in the gurgaon service center on 20th january 2017.

Address:
Shop no 578/2, new railway rd, near obc bank, gurugram, haryana 122001

Since then, i have been issued 5 different jobsheets for the same problem. I received calls from the customer care department saying my issue has been resolved and i may pick it up. So, i went to the service center 5 times till date:
First time, they misplaced my original battery with an old and non fuctioning battery. So the phone could not be switched on.
Second time, they changed the battery but my original android issue was left untouched.
Third time, they took in the phone but did nothing to resolve the problem.
Fourth time, they pretended to be clueless and said it will go to the company. Now, a fifth jobsheet has been issued.
Jobsheets numbers:
20th january[protected]t001
2nd february[protected]t001
20th february[protected]t001
5th march - lost the jobsheet number
30th march[protected]t001
All the above nonsense has happened within a span of three months and still counting. The assistance number never rings. Whenever i called the intex customer care number they say they will look into the matter and give me resolution within a week. But till date i have not received my phone. Please tell me what to do now.