Consider few points here....
1. Any balance or validity remaining in your account will not be refunded.
2. No refund will be given if you return the CPE back to airtel
3. Calculate airtel's economy sports + ess alacarte + multiroom and tatasky's supreme sports+multiroom and identify which is cheaper
4. Because getting a new connection involves the entry amount, which you can actually use for paying the additional charge for ess for few months and be hoped that the issue will be sorted out soon.
5. If you really move out of airtel then whats your need, if you prefer quantity then go for d2h, for quality choose tatasky. I am using tatasky for more than 6 years now and never smashed my head on wall even for a single day.