And things were going so well. It is hard espeacially in this situation, you didn't want to hear what they had to say and they weren't listening to you either. It is incredibly difficult and it is unlikely that you will get your point across effectively. They have invested so much of their life and hopes into the society and placed so much trust in them it is unlikely that they can be persuaded to your point of view.
I find it helpful in any situation like this to reassure the other party of my love and respect. I tell them that I am currently struggling with doubts but feel that Jehovah will give me the time I need to sort them out. If they come up with a criticism then repeat it back, e.g. "I think you should wait on Jehovah to sort things out," respond with "I know that you believe that Jehovah will sort this out in his own time so in the meantime I have to deal with this the best way I can."
You can always acknowledge any expressed feelings without taking responsibility for them. E.g. I am sorry if you feel hurt, disappointed, confused etc. People's feelings are their own but by acknowledging how they feel it can stop things escalating.
If they arrange to come again focus on what you can say rather than what would incriminate you as a raging apostate. This is damage control rather than conversion so don't be led into a doctrinal discussion if you feel they are not listening.
Don't feel bad about lying after all the society has been lying to you for years and hasn't batted an eyelid once. They are so good at it your Dad believes the lies too.
Good luck and I am truly sorry things went a bit pear shaped for you.