Please stop calling me and sort out the problem!

As I paid my Cape Union Mart account via EFT in June I didn't have my card number with me so I used my Name and Surname as a reference. I got a call from RCS in July saying that my account is overdue. I explained to them the situation and they asked me to mail the proof of payment to them with a detailed explanation of what happened, which I did immediately. Since then I have received more than ten calls, some on weekends and evenings, still asking me to pay my account. I have explained the story to every person that called me and sent numerous mails to different people with the proof of payment. These people phoning me can actually see the payment reflecting on their system, but for some or other reason they struggle to allocate it to my account.<br> <br> Can I please ask RCS head office to update their system accordingly and stop phoning me asking me for money.