Alliance — Internet connection Disrupted since 8th June 2020

My lco is dum dum cantonment, subhas nagar, dulal saha. On 8th june there was thunder and lightning in the evening. Immediately after that the connection was disrupted. It has been two days but no improvement. A person from lco came to check and confirmed that router is malfunctioning but i can clearly see that two signal lights are working on router. If the router was malfunctioning then the entire router would be off. This issue of connection disruption has been happening on and off.