Texts still sending as iMessage to Android device

Here is my rant/how do I fix.

This garbage wanna be waste of time iMessage keeps telling me I'm using iMessage to send my dad's android messages.

He just got rid of his iPhone 4S since he thought it sucked. I've tried deleting his number, deleting complete contact. Turning iMessage off won't even allow me to send him a text. It's not iOS6 but since iOS5 did this to me too. I'm tired off this non sense Apple is doing to try and compete with Android since Android is all high-tech. I may have to jump off the Apple band wagon, I've been touching squares on my iPhone since the first iPhone. But will I go to any other phone? Android and others are ugly and have ugly an OS. I'm going to a Jitter Bug phone. lol no, but god I'm tired of this stupid garbage non-sense but yet I'm still waiting for the iPhone 5 to drop so I can go get that piece of sh*t and complain about that having problems. HOW DO YOU FIX THIS IMESSAGE GARBAGE?! My dad doesnt know how to delete his iphone from apple or whatever or have access to another iphone since hes on sprint now with android.

If you like pop tarts im afraid of turtles and I eat toasters. ****.

AND NOW I CANT SELECT iOS6 for the operating system down below?!?!!? OMG IM GOING TO SMASH MY IPHONE AND PROBABLY END UP BUYING A 4S AND WASTE 400$ THEN ANOTHER 500$ TO CANCEL THE CONTRACT AND GET THE IPHONE 5. WHAT IS WRONG WITH ME.