their staff messed up again and again

Call centre agent call me to change my debit order in December, told her she must put the correct date for January, debit order goes off 25th returns 26th i get paid 27th and they tell me its not their fault, try change the debit order and this month goes off again and returned this morning again. Told them they must pay me back for returned debit orders and they say its not their fault and its not my fault so maybe its Eskom's fault ??? But let me not have money in my account for the debit order and the world will come to an end with their calls and stories...... Asked to speak to a superior and was told they will forward this matter to him and he will call me 2 weeks ago. This is unacceptable.....