POOR SERVICE - NOT KEEPING UP TO THEIR PROMISE

i had sent my car in last April for a full engine overhaul which i was requested to pay R20354.69. On the invoice it had stated that repairs are guaranteed for 12 months. my car had broke down last Saturday evening. I took my car in on Tuesday caused of the public holiday. The service i had experienced was extremely bad. the Services Manager at Pinetown was rude and refused to help even though the Umhlanga branch advise that it still falls under warranty. My husband had call the lady at the Pinetown branch and she had advised that we should send an email through and she will attend to the matter. Upon doing so i was advise that she had escalated the matter as it does not fall in her department. This morning the Pinetown branch send me an email saying that their service is for 20 000km or 12 months or which ever comes first. i had advised them that that was not stated on the invoice. The service manager had still refused. i had contacted customer SA and they had advised that this is unfair for the pinetown branch not to assist and advise that i should take it up further. i have just been sent from pillar to post.