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Sapo, DNS and (Real) Dynamic a Records

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So lately, I am having problems accessing my at home. This domain sits on a dynamic IP address, and I use editdns to update the DNS records.

EditDNS advertises my A record with a 0 TTL. However, I found that my ISP Sapo caches the record with a huge TTL:        604800    IN    A

Before I shout “what th f0ck are wrong with this guys”, I still have to do a quick read of the relevant RFC, because I think that a 0 TTL may not be a “standard” thing…

As always, if you know something about this, please shoot! :-)