Airtel — airtel 4g hotspot wifi no 4g signal. poor service by customer care

Not getting 3g or 4g signal in my device. Customer care ppl told me that 3g or 4g service is in inactive status due to their technical issue. But their are not ready to solve it soon or provide me any alternative. I did reset my device too but of no use. My office work is completely stopped due to this. Such a worst service by airtel customer care. Pls help me how to take this further.