Harassment by Collections department

23/03 informed via sms to use account number vs card number for reference when making EFT payment into my Totalsports account. 25/03 got SMS of balance and instalment due by the 1/04. 27/03 payment of R110 made into account. 08/04 sms informing me of arrears or ignore if paid so I ignored. 10/04 another SMS so I called number listed. Explained my situation and told to email proof of payment to [Email Removed] 17/04 another SMS about account in arrears. Called again and told my matter would be cleared two weeks from email so by 24/04. 20/04 get a call from collections department and I very sternly informed the lady of all which had transpired in the two weeks prior her call. She hung up without informing me of next actions. 22/04 get another call to inform me of intentions to assist me with paying overdue account. Agent was very patronising so I responded in the same manner. I was also informed that I shouted at the lady who called on the 20/04 and patronised further. I then informed the agent to call after 13:00 as I had a client to see. I am now waiting to be called and given an alternative email address to send proof of payment as i am a loyal customer of over a decade.