1) A sunni muslim has asked me to prove from quran that the entire universe was created for the love of ahlulbait(hadees e kisa) as he says the verse 33:33 only talks about purity.

2) He always asks me these controversial questions but never listens to me properly and gives me dawat to become a sunni muslim when I am not able to answer him from his references or quran.

Should I ignore such kind of people or should i indulge in debates with them . For example if he is saying that saying ya ali madad is shirk so should i stay silent (he will think he is victorious) or should i reply to him?

1) Many things you can’t prove by Quran. Ask your fellow brother if he can pray 2 Rakats Namaz by referring Holy Quran. Yes Namaz has been commanded in Quran but not how to offer it. Can he prove the Khilafat of the first three caliphs from Quran and if not then how come they became the leader of Ummah. Who gave them authority to collect Zakat and rule over Muslims? Can he prove how to perform Nikah, how toperform Hajj ( one of the pillar of Islam)
Yes Holy Prophet has said that Allah has created his Holy being at first and also He (saww) said My Ahlul Bait are from my Noor (light). Then another way it has said that Allah has created this universe out of the love of His Prophet.

Quran has says:
وَسَخَّرَ لَكُم مَّا فِي السَّمَاوَاتِ وَمَا فِي الْأَرْضِ جَمِيعًا مِّنْهُ إِنَّ فِي ذَٰلِكَ لَآيَاتٍ لِّقَوْمٍ يَتَفَكَّرُونَ

And He has made subservient to you, [as a gift] from Himself, all that is in the heavens and on earth: in this, behold, there are messages indeed for people who think!

When this universe can be for an ordinary Believer then of course Prophet (saww) and his holy House Holds deserves many time more than any believer.

2) One day you ask him please tell me the definition of “shirk” and “Tawheed” and is seeking help in other than Allah shirk? If yes then why do we seek help in our daily life many many times?

What does this ayah mean:
يَا أَيُّهَا الَّذِينَ آمَنُوا اتَّقُوا اللَّهَ وَابْتَغُوا إِلَيْهِ الْوَسِيلَةَ وَجَاهِدُوا فِي سَبِيلِهِ لَعَلَّكُمْ تُفْلِحُونَ

O YOU who have attained to faith! Remain conscious of God, and seek to come closer unto Him, and strive hard in His cause, so that you might attain to a happy state.

If he wishes we can give many more example where he does shirk in his daily life.
But the problem is with such people they don’t know the exact meaning of Islam they just follow the Salafi’s Islam.