Unsatisfied customer

I purchased my 1st smart tv on December 2020,it lasted couple months due to lcd having a yellow line which I sent back to your store and I got a refund were I purchased my 2nd smart tv. This again lasted couple of months, tv keeps freezing. I did contact you and guys came in from master audio vision and told me that it needs a software upgrade and they took my TV on the 29/07/2021.0n 02/08/2021 guys from master audio vision brought my TV and said its fixed, shockingly the main board has been replaced yet I was told it's a software problem,and finally my TV is still freezing and it worst than before. I am realy unhappy because this is a brand new TV. Please can I be contacted asap by the manager of this store, I would like to bring in this tv to yourls store for a refund or voucher to purchase another brand tv.