Account not settled

On 10 February 2016, my sister went to pay my account for my February orders, the amount she paid was R483.90. She used the wrong reference, but the money was deposited to Avon. I then contacted my leader to please sort it out for me and i even sibmitted proof of payment. She was unsuccessful, so i ended uo calling Credit Control twice on the 1st of March and on the 3rd of March, i was told to email the proof, of which i did, and i got a response that it will be processed. To this day i am still waiting for it to be processed, it has been more than a week and almost a month since i have been battling for the payment to reflect on my account. Now i cannot pay my March orders because it will first pay tge February order and then i will be owing for March.