Xiaomi India — Delay on mobile repair

Address:

First Floor, Shree Laxmi Sagar Apt Samarth Chhowk, Ambernath East, Ambernath, Maharashtra 421501

My device is Poco X3 PRO and i bought it July last year. On 28th October 2022 My phone automatically switched off. So when i contact to nearest MI service center, they said that it is due to motherboard issue and they also promise me that it will be repaired within 10 days. After 10 days I contacted them and they inform that they had a stock issue of motherboard. So why didn't they tell me that they had motherboard stock issue at first, so i can go for next service center. Please concern my complaint and fully resolve my problem because I have no other device to use and I am a working man