Huawei Sim tray poor quality

6 months ago I purchased a Huawei P40 lite at the vodacom store in tygervalley. My sim tray broke phone still works perfectly picks the simcard up etc. 18th of January I booked the cellphone in for repair. On the 20th of January they confirmed the repair price which was 3077.50 for a sim tray perfectly working phone. The 21st I declined the repair because the price is ridiculous. The lady told me my mother board is faulty but the phone works perfectly. So how come they just don't want to fix the sim tray which obviously is of poor quality. I still have a year and six months to pay for this cellphone.