Payment does not reflect on my account

I have paid my account (full account) on 12 March 2015 and the payment still does not reflect on my account. Mr. Price send me a SMS saying that I am in arrears on this account. The accounts department asked me to fax through my proof of payment, which I did this morning and still they tell me that the money does not reflect on my account. Upon asking when they told me that they don't know, they have problems with the banks. The lady was not helpful at all. Then I asked to speak to a Manager and was place on hold. I phone again and Johnathan answered the phone, by this time I was very anger, but he calmly said that he will help me. This is all I wanted, somebody to look into way my payment is not reflecting and not to be told that she does not know. Mr. Price management should look into sending SMS'se to people if they are not sure if the account has been paid. Thank you Johnathan for your help!