Pathetic repair service from Vodacom!!!!

I took out a contract a year and two months ago, where I received a LG G6. After having the phone for 2 months the phone had to go in for repairs on the microphone and charging port. You could not hear anyone on the phone and the charging port says damp detected even though it hasnt been near water.Since then the phone has been in for the exact same thing 5 times (handed in at Alberton repair centre). The phone has been exchanged twice and to date the phone is not fixed as it does the same thing. When asked to exchange the phone for a different phone and make which is the same equivalent to the G6 it got denied. I am absolutely disgusted with the service i am receiving from Vodacom. HOW MANY TIMES DOES VODACOM EXPECT A CUSTOMER TO BRING A PHONE IN FOR THE SAME PROBLEM. I have 4 contracts with Vodacom and will be cancelling ALL of them.