POOR SERVICE AND DAMAGED SPEED POINTS

On 31 December 2015 i passed to engine garage main road to put petrol,the petrol attender by the name of violet removed the card before time,and the receipt came out giving her the error msg:card removal error then she said we must go inside and msg reported to me that the transaction went through,when we get inside they wanted me to pay again and promised to reverse the other one i refused they called their manager who was so unprofessional and he threatened me by saying that he will call the mechanic to remove the petrol and they will give me money back,i said okay and once anything goes wrong i will hold him responsible. . I cannot believe that any management of any reputable company will allow this to happen?Instead of fixing their speed points,i then contacted my bank while i was there & they confirmed that the transaction went through their speed is faulty and holding it they even advised him what needs 2 be done,he dropped the call,Please can anybody tell them that their service sucks. This is beyond ridiculous. I challenge anybody to apologies to me.I will definitely never be buying at this branch again and would not recommend them to anyone either