I've asked car track last year December to debit earlier and they said yes,and it was not done

I've asked car track last year December to debit earlier and they said yes,and it was not done. Last month my debit was returned by my bank and I sent WhatsApp again and ask them to debit again, they said yes and it was not done and they kept on phoning me more than 6 times day and sending emails...in short they make empty promises if you send WhatsApp