Apple India — phone restart issue and I feel harassed

Address: New Delhi, Delhi, 110005

My apple phone keeps on restarting again and again multiple times and i am unaable to use it since the time apple updated its software few months back. They should have ideally tested on all the models before bringing it out in the market. Multiple times in emergency i have not been able to use phone because of this restart issue and i feel mentally harassed and need a a solution to it. Either resolve the issueor get me a new mobile or refund the money.

I feel mentally harassed and want a solution to it at the earliest.