Airtel — 4g sim upgradation :no service

Address:

Dehradun, Uttarakhand, 248001

I had gone for a sim upgradation to 4g on 11th october 2017 at 5:00pm and was issued a new sim to be used once the signal ran out in the old sim. After about 3 hours i changed my 3g sim to the new sim as there was no service. It's been 2 days and the 4g sim is not yet activated. Please look into the matter as this is causing serious problem as it is affecting my patients appointments.