Charged for purchase never made

Mid 2015 I started getting accounts for an alleged purchase made in 2013. On 22.12.15 I physically went to the store and after 45 minutes Portia was unable to help me or to provide evidence for this purchase. I contacted Customer services per e-mail on 09.01. The reply Good day Mev Van Rensburg<br> <br> Account number :***<br> In response to your email received, please note that we are unable to retrieve the proof of purchase from our side, it is obtainable form the store of purchase.<br> <br> Attached please find the statement reflecting the transaction.<br> We trust the information provided will be of assistance to you.<br> NOTE: Account numbers as well as addresses differ from mine.<br> I rep****:Dear Madam, <br> I never made this purchase reflected and why would I do it for such a small amount when my account was not used for such a long time. Why also have I only received the notification of the purchase in 2015? <br> My address also has changed 3 times since this alleged purchase<br> I expect you to do a thorough investigation and obtain the evidence from the store where I made this so-called purchase.<br> Regards, <br> Russel Jansen van Rensburg<br> <br> Please could you assist me.<br> <br> <br> <br>