Help help

Monday 24 October 22 upgraded and took 2x new contracts out got phone had screeen protectors put on as well as purchase x2 glove covers. All excited was getting to know phone more noticed phone started freezing and not able to access contacts. Went in Tuesday 25 October 22 N1 city branch then was told I can not change the phone by the supervisor for any other type of phone even if I was unhappy about the phone they can send it away but will replace the same phone. Finally got home after 3 hours of waiting at the store then sat with phone which was just replaced my contacts does not open then freeze again. Have to go back to branch tomorrow 26 October 22 for more frustrating pain and a waist of time and money cause I already paid for 2x screen protectors which was ********** in front of by supervisor. Please help never ever been so disattissied with a brand new x 2 contract purchases.