Do this to replay the issue
iptables -A INPUT -s 10.64.7.109 -j ACCEPT
iptables -A INPUT -s 10.64.7.109 -j REJECT
iptables -P INPUT DROP
But this won't block 10.64.7.109 and the first rule hit will be accept. You're sharing the output that's got the IP you're interested in and I can't really see why your rules will blocking it.
You can insert another rule at first position which will resolve your issues but without seeing your rules I can't say that it is the best way to solve your issue
iptables -I INPUT 1 -s 10.64.7.109 -j ACCEPT