Repair job not done

I booked in my iphone on the 29th of April the screen was cracked and the phone would not charge or switch on at all. Since the phone arrived DOA a the store i was told that a quote would be sent to me after the phone is diagnosed later that evenong i recieved a quote for R1798 for the scrren to be repalced and the battery i accepted. The following day 29 April i recieved a call from that store that my phone was repaired and ready for collectioni went to collect the phone and paid the requested amount. a day or 2 later i noticed the phones battery would get drained quickly withouth me having to use the phone at all, I booked my phone in again on the 28th of May since it stopped charging and wouldnt switch on again, yesterday i recieved an SMS stating my phone is irreplacable and ready for collection. Honestly i feel cheated after having spent R1798 for a repair job i ask myself if that battery that was inserted in my phone an original iphone battery i had to constantly have my phone on the charger if i wanted to use it but it was new how is that possible. I highly dount i will be needing your services for any of my apple devices after recieving such pathetic service.