SAMSUNG S4 TAB

On Saturday the 13 February 2016 I drove all the way from Alberton to Midrand to take my phone in as it was freezing, wouldn't scroll was just generally not performing like it did when I first got it.<br> Repair centre agent booked it in and said they would let me know when it was ready for collection.<br> Monday 15 February 2016 my daughter received and email from them saying my phone was ready for collection.<br> I went all the way there to collect and asked what they had done and was told they had upgraded the soft wear. i checked it and the phone seemed to be okay.<br> Once i got home an started using the phone the problems started reoccuring and as time goes on it just gets more and more unresponsive. <br> I am at my wits end as I am paying for this phone and am not able to utilise it as I should.