Techtrace - Unauthorised Debit

Good day, i would like to complain about a debit order being deducted from my account since 29th September 2017. The debit order is showing as TECHTRACE EM- ********** 0-3.

29 Sept 2017 - R39 1 Nov 2017 - R39 1 Dec 2017 - R39 22 Dec 2017 - R39 1 Feb 2018 - R39 1 Mar 2018 - R39

I would like to know what this is for and to stop this immediately,

Thank you.