The URCALL field only has 8 characters. XRF070CL is the proper syntax for connecting to XRF070 module C.
I believe XRF070 is a relatively new XReflector. It's likely there's no entry in the hosts file for that XRF unless you have updated your hosts files very recently. If you're using DStar Commander, update your host files with the HOSTUPDT command, if using another image, you'll need to manually check and/or update the host files.