The continuation of the HTC saga

I bought an HTC Desire S smartphone in June. Since then, I sent it three times for repair to Dynafix, which is apparently the HTC Repair Center for Belgium. For the 3rd time, Dynafix replaced the mainboard for my phone, which fixed the original problem. However, I quickly noticed a new and easy to reproduce problem that I communicated to the HTC call center. I was told over the phone that I will get a replacement unit. However, after returning the original unit to th repair center, the only thing I got was a discrepancy report saying that I returned a phone with a different IMEI number than the original. Of course it was different, Dynafix replaced the mainboard, so it had to be different! I am waiting for weeks now to get the promised replacement.