Cresta istore service very disappointing considering the amount of staff they have

I booked an appointment at Cresta istore on Wednesday for Thursday at 17h00. I met with a great trainee technician who assisted me with the forms to complete to get a new battery. I was told on numerous occasions that to replace a battery can take up to 30 minutes. This was not the case as I found out at 17h30 on Thursday evening - the reason is that there are a lot of jobs and the technicians are busy or understaffed. Not sure which one - anyway I was assured I would get it back on Friday - Friday came and I received notification that it had been booked in and then at 15h59 was told that the phone was with a technician, Several emails latter and no responses I figured that I would not get my phone on Friday. Saturday I sent various emails - no response and I was put through to a call center - The gentleman that assisted me had even less information so he promised to escalate the call and I would get a return call within an hour - well that did not happen either. So I sit without a phone, no knowledge of what is happening and a completely unresponsive team at Cresta. I now see why people prefer Clearwater store because sadly at Cresta there is no management present.