Poor Service or should I say no service

I have been sending emails regarding policy premiums based on my salary in 2016 which is almost double what I earn now, just get the automated response someone will get back to you. After sending a complaint email response was received that someone will contact me...well that has not happened yet. Website is not working as you can't submit a complaint, no agent available to talk to. Now I see on another complaint that you have to give a months notice. So this is going to cost me at least another three months premiums because Zestlife agents are working "remotely" really, this is an excuse. What do I need to do to get someone's attention to contact me???