Do you think this is unfair dismissal?

I started this new job 3 weeks ago and they fired me today saying they didn't think I was suitable as I kept making mistakes with the fillin which I corrected. I got the feeling my boss didn't like me but she invited me to thier Christmas party today it doesn't make sense to invite me if they were... show more I started this new job 3 weeks ago and they fired me today saying they didn't think I was suitable as I kept making mistakes with the fillin which I corrected. I got the feeling my boss didn't like me but she invited me to thier Christmas party today it doesn't make sense to invite me if they were getting rid of me. They had said before if I want extra help ask which I did. Do you think this dismissal is fair as I am thinking to take further action.
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