Poor Service

Most unprofessional service ever. My phone was booked in on the 3rd of November 2019 for repairs. Every time I collect the phone, it still has the same problem. It has been sent back now for the third time with the same problem. The last time I was told that the phone had to be sent to head office to replace the motherboard. I phoned head office repairs today, they had no record of the latest job number. I have made 7 calls today trying to speak to someone at the repair centre, either the phone just rings, or they tell me to hold, after holding for 3 mins I eventually end the call.