filling up at garage charged twice

I had last filled up at the Palmview caltex garage on Monday, 4 January 2016.... and received the sms of the payment.<br> <br> Then again today, I get another sms for payment of the same amount.<br> <br> When I check an online statement,i see that the amount was charged twice... on Monday and yesterday again...how is this possible???? When I hadn't used my card or filled up yesterday?????? <br> <br> It's co-incidence that I checked today as I'm at home, what if this has been happening a lot????? I always get the messages repeatedly.<br> <br> <br> I want a response asap and the matter must be looked into.<br> <br> Highly disappointed!!!