Dud Phone

I have a new Samsung Galexy A3 phone - 19 May 2017 - it has problems - the screen dies - but you can hear messages etc. coming through. Vodacentre get it back to life. Then it was taken in - data lost - screen protector removed - and when I got it back I think everything that could be replaced had been replaced. A month later same problem and was then advised that there was now a guarantee on the repairs. I also had to replace the screen protector at my cost. The problem continues - I need my phone use it for office banking among other things and cannot be with a loan phone. Samsung phone to apologise but the point is can no one realise this phone is a dud. My previous Samsung is still in operation and going for 4 years. I have never experienced such a frustrating problem before and no one really wants to make a call and replace the phone. Soon the year guarantee will be passed and then it will be my problem