Jaquar — Head shower service

I have sent a complaint to jaquar on 25.01.22 as their toll free no is not responding. It was booked on 31.1.22. Service person told me long knob will be instaled in diverter . He will give me a call when it will be arranged. This time this call is to be closed.
After three days he stopped to pick my phone call.
I again registered a complaint. No one visited and more than 10 days gone.
No response till date