Xiaomi Redmi 11 Pro Plus Phone Malfunctioning After 3 Months

It's been only three months since I bought my Xiaomi Redmi 11 Pro Plus phone, but I've already grown to despise it. The phone cannot establish a connection to the network, and when a call is being made, the display gets extremely hot, making the device uncomfortable to hold. My capacity to use the internet has been impacted as a result of this issue, which is making my work more difficult. My request to have the device repaired or replaced has been denied by customer service, despite the fact that I have made the request. I am in need of your assistance to find a solution to this problem at this time. I want to express my gratitude to you in advance for your assistance.