year old debit

I cancelled a contract with Telkom / 8ta in december 2018. I received a notification from my bank on Friday that a debit order for R8.22 was processed by telkom. According to Telkom it relates to a invoice dated January 2019. How in the name of all that is holy do you process an amount of R8.22 more than a year later? Nevermind the fact that all the payments on this account were via debit order anyway