Hi,
You are using the "akeebas" plugin and not the "akeebasubs" one.
The akeebasubs one has been developped by us, the second one not, this don't mean that akeebas is not a correct plugin, we validate it, it's just that it will require more time to review the code.
First of all, in the settings of the subscription levels in akeebas subscriptions I still see a price for each levels.
This price should be set in the HikaShop product, regarding this product thanks to indicate me which products have these subscriptions.