PAID MY ACCOUNTS BUT STILL GETTING THREATS

I made a payment on my PicknPay store account, whose debt collection was unwisely outsourced by PicknPay to the inept RCS Group. Payment was made on 25 July 2019 and it has not been recorded or captured by RCS. So they are sending me threats everyday on my phone. I called almost 8 times over the past few days to enquire about this and sent proof of payment 4 times to email addresses they gave me. Now they are asking me to send to different email addresses and my account is still suspended. I am blown away by the level of incompetence and unprofessionalism displayed. Truth be told, I never had a single good experience with this horrid company.