Adapt Bookly plug in Calendar to integrate with ical

I currently have a wordpress site which uses the Bookly appointments system. This diary partially integrates with google calendar, it pushes appointments through ical, but it doesn't work the other way properly. I am assured by the developer it can/has been done, but he is less than helpful. I need someone to fully integrate this. PLEASE do not bid if you cant do it, if you say you can and then get bored, sick, need to go to a friends wedding, etc. Look at my profile and see how much I spend on freelancers. I am looking for someone I can rely on. Get this right, there will be more work.