I can just imagine your shock! An unplanned pregnancy can be really difficult to digest. I have read that there is less than 1% failure rate for sterilisation...I can think that you feel very unlucky. I have also read that it doesn't mean that the doctor is to blame for the failure, unfortunenately these things happen. None the less I can really understand that you feel angry!
If you have strong feelings of not wanting the baby I would suggest speaking to a psychologist since your emotional state about the unwanted pregnancy may affect your unborn child. There is a lot evidence showing that a fetus knows if they are unwanted, not that I how if this is what you are feeling.
I can totally imagine! When I had the mirena fitted the doctor told me that the failure rate is similiar to that of sterilisation. When I had an "unplanned" ectopic pregnancy while having the mirena I was also extremely upset and shocked
If you are willing to travel, I would HIGHLY recommend Dr Lizette White at Stellenbosch Medi-Clinic. She shares a practice with Dr Reinarda van Waart's brother. She is extremely professional and absolutely excellent in what she does.