Hi moggs261,
Thank you for reaching out to us in our community and welcome, sorry to hear you aren't able to hear the caller when they ring, I have tried to locate you however wasn't able with the details we have for you, can you try removing everything from the phone socket including any extensions, filters and the phone, try a different phone, if you have a standard none powered phone this would be best.
I will be more than happy to help further and arrange a technician if required, if a Technician comes and it is the equipment including extensions, there would be a £25 charge, this is why I would like you to be sure.
Regards
Paul.