Why is my Bank Card not working?

i am currently on holiday. I recently extended my stay by an additional 2 weeks, and last week my bank card stopped working at local ATMs (it worked before). The message i get ia invalid account or transaction...now i'm now stranded without money, and all my attempts at trying to contact Capitec has been unsuccessful ...my sister's visit to the branches has also been unsuccessful. I am getting really upset.. I cant access my money and slept on a trainstation yeaterday night. Please help me! I cant wait another 3-5 days!