LG G5 GPS Faulty

Good day, I have had too book my LG G5 in 3 times since Oct/Nov last year (I got the phone in July 2016). This was as Vodacom in Tygervalley (Cape Town) as it was the store where I have gotten the original contract.

Every time I get it back the exact same problem arises again. The last 2 times the phone has actually gotten worse. The first time it was just the GPS was faulty, the 2nd and 3rd times the phone has actually gotten extremely slow as well. The first time they replaced the motherboard, the second time they just updated the software and the last time they replaced the motherboard again (this was 2 Feb 2018). I am NOT going to book my phone in again as this is costing me money and it's extremely irritating. I have to update and backup and re-install the apps every time and I also use my phone for work. I am willing to go somewhere where they can test it to verify the fault, but I am NOT going to book the phone in again. I want a new phone, it doesn't have to be a LG G5, but it must at least be equal to that. I have phoned the Tygervalley Head Office branch for Vodacom and they told me to phone ********** . The Call centre agent told me repeatedly that they can't help me and I HAVE to book the phone in AGAIN.

Please help me.