Bad service from standard bank

My husband is an Absa client and he swiped his card at a shop were he buy's his plumbing supplies. In store they make use of a standard bank machine for the swiping of payments. Since the 24th of March he purchased 6 times and the amounts went off his account on those purchased dates. But those 6 times was debited again on the 17th of April. A total of R28377.02 this is shocking. There is absolutely nothing that standard bank is doing to rectify this. Please can you help