galaxy S4 not working properly

Hi<br> I took my S4 in on 17 Nov 2015 for a screen replacement and i mentioned that the phone is slow, the battery runs down quickly and the play store opens on its own. my phone was in a perfect condition other than the cracked glass screen. they told me that the phone will be wiped and software updated so i need to backup everything and that this would take 3 to 5 working days. on the 7th working day i called to find out when my phone would be ready for collection and a very rude lady told me she is waiting on confirmation and cant tell me. the next day i called again and she told me that the IMEI number on my proof of purchase was not clear and i would need to resend it. (why could no1 tell me this within the \3 to 5 working day"period?!) i then sent them an email with my proof of purchase"