Phone extremely slow requesting to change to Samsung

I got a phone with you guys this month about 2-3 weeks ago I am not happy with the picture quality on the phone I also didn't know that the phone would be this slow I do not want to cancel my contract but I just wanted to know if there is no possibility that I could get a different brand like a Samsung instead because I am wanted to use the phone for my work but the phone is slow when did display quality is not that good and I feel like it would be unfair for me to continue making my monthly payments for a phone that I won't be able to use so that's why I'm asking it's not even a month old I'm asking for me to just change the brand to a Samsung if possible I am willing to pay in the difference if the deposit and monthly payment of the Samsung I want is not the same as the deposit I paid for this phone i have I had no idea that the display quality of the phone was not good I also had no idea that it would be slow the phone kick me out of apps like uber and stuff as well and I was told when I did go to call ackermans that they had a few of customers have complained that this brand does such things I mainly got the phone for my business because I am a driver for uber and Mr delivery but the phone is so slow that I can't do it randomly kick me out of the apps and stuff that's why I am kindly requesting just a brand change to Samsung that is all I'm asking because i had no idea this phone is so slow