Motorola Moto G — LOST ACCESS TO WHATSAPP. UNABLE TO REINSTATE.

Hi there. I recently lost my access to WHATSAPP and despite trying all the so called "fixes" to re-register I have not been successfull. My phone is a MOTO G ANDROID VERSION 5.1 Running 4G through Virgin Media.

When "Verifying" my phone I receive the message "Unable to connect please try again later" I then get an option to "Check Status". I then get a message "WhatsApp service status unavailable". Have tried all fixes suggested with no success.
ANY IDEAS / SOLUTIONS as driving me to distraction trying to sort this out (over a week)
All other network services are working okay on my mobile.
DJJ