Chat GPT4 not working, Chat GPT 3.5 working - where is the help?

ChatGPT4 has suddenly not worked for 2 days. Error message ‘Our systems have detected unusual activity from your system. Please try again later.’ Chat GPT3.5 does work. Why? More importantly, WHY CANNOT I TALK TO SOMEONE, or find any real help, TO FIX THIS - THE HELP CHAT BOT IS USELESS!

Followed all the advice on other threads - clear history, cache, vpn, network etc. Not working. I notice from the forums that has been a common occurrence over the last few months, but where is the help.

Can someone please contact me so this can be resolved? This is a paid for service for crying out loud!