Aditya Birla Health Insurance — Not able to make payment for renewing the policy

Website:

www.adityabirlacapital.com/healthinsurance

I have an existing Health Insurance policy from Aditya Birla and I need to renew the policy by making the premium payment online, but their portal is not working, they are picking up calls, no email support, no whattsapp support, no chat support ?? How do I renew the premium ??