Samsung S8 plus

I can't begin to explain how upset I am with vodacom. I have been a loyal customer for many years and if this is the level of service a customer received then perhaps I should move my business elsewhere. I upgraded on the 17th September at voda shop Clearwater mall to a Red package and selected the Samsung S8 plus. Upon receiving the device the device battery was not lasting even half a day. I returned the device on the 19th September for an out of box failure and the store sent it in for repairs supposedly at Samsung.. No communication was received in terms of device progress and on the 26th September I then received feedback that no fault was found, a software upgrade was done and I need to collect my device. I requested this matter be escalated as the device should have been swopped out. The store advised me the best they can do is give me a further 7 days to test the phone. I collected the device the evening 6th October and returned it the 8th October as the phone was doing the same thing. Yet again I'm left in the dark in terms of progress and when will I be receiving my device. I've called the store several times asking to speak to the manager, I'm just told to leave a message and he will get back to me.. this never happens! I'm at my wits end to a point that I'm extremely disgusted with the service and run around I am receiving from vodacom! This is absolutely appalling that you do not value your customers! This matter needs to be resolved asap, it's almost a month since my upgrade and I have yet to enjoy my new device.. so much for vip treatment for red customers!