Bank cannot stop unknown debit order

For the last hour and half been on the phone with standard bank center. The issue is simple, I have two unknown debit orders on the business account. One by telesure has been running for two years. It disappear only to resurface in two months. I turned to the bank cause I have called all these ghost companies to stop ********** activity on the business account. I spoke to 3 different agents, non of them knew what to do except I must reverse the transaction. My question is, how will I know for sure the bank won't process it again should these companies decide to present another one with different amount or reference number? I asked these two companies (Broadhost and Telesure) to send me records of my signature either written or telephonic to prove I have a business with them but they can't. Since August this year been dealing with Telesure trying to have the debit order stopped. The last resort was to ask the bank to intervene but also cannot except transferring the call from one answering machine to another, hold for minimum of 5 minutes, eventually someone decide to pull your call only to transfer you to an answering machine again. Am frustrated!!!