Hello,
JoomSEF + VM extension is working well on several thousand sites, so I do not think yours should be exceotion.
I think that the problems you have may be caused by either wrong configuration or some conflicting component.
However, in your first post you do not mentioned any other error than the messages you posted there. And those are clearly stated to be generated by PhocaSEF.
As regards duplicates and settings needed for VM extension, as well as possible problems with menus and/or module/template settins, most problems is targeted in
FAQs.
The duplicates were most likely cause by either:
1. not having VirtueMart extension installed
or
2. not purging cache or previously generated VirtueMart URLs after the extension installation
or
3. having some non-standard hack in code.
If you have any specific problem, we will be glad to help you.
P.S.: Where do we clearly state "WITH SUPPORT"? Please understand we of course try to help customers who have problems, but for price of 25 EUR we cannot help each single customer solve his site-specific problems quite oftern related to wrong or non-standard configurations.
Moreover, my comment on "expecting support" was meant in way you cannot expect guaranteed support within hours. We are not DELL and we are not charing you thousands of EURos for 4h response time support. So, please, be reasonable!