Unauthorized deduction from my account

The following unauthorized transaction occurred and i require a refund as i did not order anything and also did not received any item.

View Transaction Detail
Name Smart Account Account Number 6219*****75 Type DEMAND DEPOSIT

1. Transaction Details
Description One 899.99 2CO.COM*BITD 479012*7099 02 DEC
Description Two 74008518336847608001431 000000 S M 405913 00 1181202
Transaction Amount 899.99
Service Fee 0.00
Authorisation Date 02 Dec 2018
Effective Date 04 Dec 2018
Post Date 04 Dec 2018
Current Balance ***2.02
Cash Amount 0.00
Original Currency Amount 899.99
ENC Amount 0.00
ENC Days 0000000000000 Cleared 0
2. Transaction Description
Code 5254
Description Pos International Purchase
Debit Ca Category Payme
Sub-Category Electronic Payment

3. Customer Service Information
User CodeUser Name - Contact Number