Sunflame Enterprises — cooking range

I had purchased a sunflame cooking range on 8 dec. 2017. On 13 feb 2018, the regulator knob of the oven broke and since then i have been unable to use the oven. I complained to darshan services, diva, mumbai on that date but they are unable to replace the part on the excuse o[censored]navailability of the part. I was even informed by the service centre that since i had waited so long for replacement, a couple of weeks/months more should not bother me. My complaint number was only assigned on 23 feb. 2018. It is d[protected]. Kindly help to resolve the issue. The toll free helpline number of sunflame is not working, and i really do not know what i can do about this issue.