Broken phone

My sony experia gave problems from the start (within OBF time when first reported) but send after 7 days, and is now going in for the 3rd time within 7 months. Six if you take the time i could not use it. I was informed by the branch in Bloemfontein to phone vodacom myself, handwriting will prove that. I went to another repair centre and was assisted properly. After the second repair i was informed that should the phone go in for the 3rd time a special OBF will be done. Now the advanced repair centre have a problem with that. I can not talk to \Portia"as she only communicates via email. What nonsense is that. Everytime my phone gets booked in for repairs"