need some advise with DNS problems
 

I changed from an old, broken server to a new one and moved all sites (using ispcfg 3) to the new server.
everythign went smooth except for one domain.
this one domain is a co.za domain, registered via marcaria.com and using their DNS. I only provide the website content.

after this move I asked the owner to change his DNS to point to the new server.

the result is that now his A-records point to the old and the new server, giving you a 50% chance of landing on the right server.

here are two tests:

http://dnssy.com/lookup.php?q=jadeyoga.co.za&t=A shows two IPs for the a-record and

http://dnssy.com/report.php?q=jadeyoga.co.za shows several DNS issues.

I asked the client to chat with the co.za registry but they sent him to me, same goes for marcaria.com whose DNS servers he is using.

since I don't provide anything else than hosting for him, I am not sure how I can fix this and where this problem could originate on my server.

any advice?

There is nothing else you can do, it's his problem.

They did not changed the dns registry, they've only added a new one... do a

and you will se it your self

Thanks.
I was just trying to make sure I haven't overlooked anything on my end...