iStore Gateway horrible and rotten service

My father took his phone to iStore Cape Town, and they booked his phone in to iStore Durban for a change of battery as iStore in Cape Town had no stock. He took his phone to iStore Gateway, and we have been waiting for his phone for over a month. Every time they make up excuses that makes no sense. Not only that, the battery only lasted between 2 and 3 hours. So we booked it in to change the battery, and my father has been sitting without his business phone for over a month.. All because Apple themselves **********ly had been supplying inferior batteries deliberately. Now they have been compelled to replace these batteries they still punish the client by using methods like this. Thank you,

Haniefa