Every month, I get messages from Cartrack failing to debit my account

Every month, I get messages from Cartrack failing to debit my account. I then have to do EFT. This is a monthly occurrence. Yet I always make sure there is money on the agreed date, the 4th of d month. Every month I then get messages that debit order didn't go through, then I call Cartrack - it's a recurring cycle every month. Calling Cartrack this morning, I was told debit order didn't go through for there was no money in my account. It was an irritating and untrue statement for all other more expensive debit orders went through and there is still more than the R261.04 that Cartrack must debit. It's quite an irritating situation i go through monthly. And next thing, ea month, I must make calls to enquire why they didn't debit my account instead of them just sorting out the de*****eck or whatever