lack of customer service

On the 20 June I upgraded (more like downgrading) my contract from Top Up 200 to iChoose Flexi 150 and i took Samsung Core Prime at CNA, on the 21st I received my first call and i couldnt hear a thing as the speaker had some static sound so I took a half day on the 26th and i was given a new handset, I got a call from my boss as I was leaving the mall and I experience the same problem I then took it back the second time on the 1st or 2nd July the consultant at CNA told me they have to send in to Vodacom since it was the second handset and a contract i had no problem with that and for two weeks i was without a phone. Went back to CNA got a new handset received my first call same problem so I email vodacom customer care got a response back the following day telling me that I must take the phone back to CNA I told the mailer to read my email again and not skim through it and later that day I got a call from Zukiswa and she said she was going to escalate the matter i'd get a call in 24-48 hrs, since I did not get the call mid week a week later I email the i got a mail saying the process takes 96hrs, all in all am stuck and paying for a dummy phone can only send smses and take pictures