What should I do if a lot of my friends and family are trying to prove Buddhism wrong with the laws of impermanence or planes of existence, & I do not want to debate this with them as I do not want to arise the Poisons, but I keep getting into it?
Why are they trying to do that?
I won't (and can't) debate Buddhism at all. If someone asks me about something I can try to explain what I've understood, but it often and quickly turns to "I don't know" if they ask me something -- I don't know how to explain it to them, partly because of the way they're thinking.
It doesn't bother me much though -- doesn't mean that Buddhism is wrong, or that I'm wrong, or that they're wrong -- I'm not a monk or a Buddha, a trained teacher.
Also, on the topic of planes of existence, is there any proof in a sense to their existence
I'm not very interested in that topic.
That doctrine -- not to mention the doctrine of rebirth generally -- is one of the more colourful doctrines of Buddhism, so it's not surprising if they "pick on" that as a doctrine that's hard to believe or to understand.
One way to see it is to say that humans and animals definitely exist, the other planes aren't so visible but don't other religions teach that doctrine too (e.g. heaven and hell)?
Another way might be to say that they are different states of mind.
You can possibly take them as being states of mind in the present.
The Gates of Paradise
A soldier named Nobushige came to Hakuin, and asked: "Is there really a paradise and a hell?"
"Who are you?" inquired Hakuin.
"I am a samurai," the warrior replied.
"You, a soldier!" exclaimed Hakuin. "What kind of ruler would have you as his guard? Your face looks like that of a beggar."
Nobushige became so angry that he began to draw his sword, but Hakuin continued: "So you have a sword! Your weapon is probably much too dull to cut off my head."
As Nobushige drew his sword Hakuin remarked: "Here open the gates of hell!"
At these words the samurai, perceiving the master's discipline, sheathed his sword and bowed.
"Here open the gates of paradise," said Hakuin.