Blue again!!

So Mzanzi decides to merge/join Blue security. Firstly, I did not sign a contact with Blue I left them due to the occasional double debits that they would randomly decide to deduct. So along comes blue and boom, after numerous calls to blue and a few to Mzanzi to clarify that the annual fees have been deducted already, Blue security decides to decust these fees for a second time! They also tried to decuct the normal monitoring fees which then put my account into a negative balance as there were insufficient funds and this has created additional charges for insufficient funds and reversal charges. Had they deducted only what was owing to them no additional charges would have been incurred on my account. Blue security has the propensity to do this, hence the reason I left the company. When you call to query people are always busy and will get back to you. If you are a prospective client Blue will respond quicker than they do when they need to provide answers to financial questions/queries. What they do is ridiculous and it is done without remorse. Could someone who actually knows what they are doing contact me and refund me for the charges that have been incurred through incompetency on your part... As I said I did not sign a contract with and would not like to. As stated you'll have no legal right to deduct monies from me let alone fees which have aalready been paid to the company I actually did sign with.