They appear to be illegally cold calling with the usual renewable energy scam. They have called 3 times already. If you get a unsolicited call from these please report the to ICO. Just search for reporting spam calls and most search engines will take you there. Unless you report this they will not be prosecuted so please it only take a minute to report.
Constant calls from this number - asking for someone that has never lived at my address and claiming to be about solar panels that are fitted to the house - there aren't any at the property. Have asked on numerous occasions for my number to be removed from their database but to no avail. Have even threatened legal action, Again to no avail.