Extremely dissappointed

I have a samsung z flip 4 that has been in to vodacom repair four times already and the problem still exists. The device is only 9 months old. Each time i get it back it does the same thing. I think its a defective device and ahould be replaced entirely. I find it very unfair that i pay my monthly obligations and dont get to use the device as it is at vodacom most of the time. I suppose vodacom will compensate me for the worktime lost as they havent bothered to replace the device. And there is no way to speak to anyone at the repairs desk to take this matter up further. Im a loyal customer with vodacom for the past 20 years, at any given time i have at least 5 to 6 contracts with them.