Hi @sanketmehta ,
Welcome to the community!
Common cause of Home phone issue is a loosed handset, ensure to check the handset connection to the modem/router or the wall socket.
We did an article that you may find helpful, this will guide you on how to perform basic troubleshooting with the your home phone.
See links below.
In this case, we've seen that the issue with your home phone is a possible line fault this is now being handled by our Engineering Team and they scheduled a TPG Technician to check your home phone.
Further updates will be provided by one of our Engineers via SMS or Phone call when it becomes available. Cheers!