The telephone number 01667204950 is being used as part of a BT scam in which the scammers ask for remote access to your computer. They pretend to be BT Openreach engineers calling about an upgrade. They inform potential victims that they have a problem with their router or internet connection and ask if they can have remote access to get the problem fixed.
In fact they are looking to gain access to your computer so they can look for personal information, bank details and passwords that they can use to scam you.