We've sent the same phone back 3 times. The phone ...

We've sent the same phone back 3 times. The phone e has a known, acknowledged, HW issue with the mic. Two times it was sent back with a factory reset and a note that it was "within spec", though no indication of how it was tested or what spec it met. Certainly not the mic spec, because that would be really hard to meet with a blown mic. The third time they waited out the warranty, and sent us a quote of 250 for repair and an indication that they were planning to replace the display panel. This is quite a novel solution, since the display is fine. Also wondering why they're willing to blindly experiment now, but wouldn't do anything the first two repair attempts. It's been MONTHS now that we've been shuttling this phone back and forth. WHY is this place that Huawei and Rogers have elected to send their phones to?