Now for the 3rd time with same problem !!!!

I have a blackberry 9729 IMEI ***42472 through Vodacom and have sent the phone in for repairs twice - I took the phone into Galleria Vodacom out let and they sent it to Gateway Umhlanga - Came back and was told that they did a software upgrade and replaced the battery - Then the phone started re-booting again and again I took into the Galleria out let and again they sent it too Gateway Umhlanga - came back and they did a software upgrade - Now again the phone is doing exactly the same thing and this time it has got so bad that at times I can even switch it on . Now if I send it in again - they will do a software upgrade and will be fine but then the same problem will start again ! This is a re-occurring problem that they can not sort out !!The phone is still under warranty and once it is out of warranty then Vodacom will wash their hands of any responsibility as then \it will be out of warranty \" not our problem\" attitude . Now I will await for the generic reply like this \" Hello cxavier,Please be advised that feedback has been forwarded to you via email.Regards,Consumer Website Team\" p.s my Name is Carlos and my e-mail is cxavier...."