Sounds like your getting some signal but not enough to lock on for service. Try posting your signal levels. You can find them by going to 192.168.0.1 > user:admin password:password > Connection > Cox Network. You would want to post your downstream and upstream levels. See here on how to upload a image to the forum or if easier, upload it to Imgur and post the link.
Also, do you have any other outlets in your house? If so, you could sacrifice those outlets(TV service?) and use a coaxial coupler to bypass your splitter. They might have couplers at the Cox store, if not, buy them online or any hardware store. For every 2 way splitter you bypass you improve your signal levels by 3.5dB. I am hoping that can get you by until a technician can get out there.