Poor after sale service

I bought my Levono Think Pad on the 4th November 2019 for business purposes from The Notebook Company in Hatfield. The beginning of this year I experienced problems with it. Out of the blue without warning the screen will turn ‘blue’ and I am forced to switch it off. Some times it will switch off with a message that an error was detected. I handed it in at The Notebook Company and received it back +/-8 days later. Not long after I received it back, I experienced the same problem. I experienced this problem regularly. I was unable to take it in as I cannot afford to be without my laptop again for more than a week. It happens any time without warning and sometimes on a daily basis. It also happened several times while on a business zoom meeting. The problem becomes so bad that I had no choice to take it in on the 1st June 2020. I received my laptop back 8 days later. Two days later I experience the same problem again and this happened twice yesterday and today. I cannot afford to be without my laptop and want a new one as they proofed by now that they are unable to fixed the problem.