Extremely poor service and no correspondence

I have been sending emails to make a payment arrangement. I have also app**** online to confirm the payment arrangement. I escalated this to ABSA. I have not received any correspondence from RL Daly. I emailed them 23 November, 26 November, 09 December and 17 December. I have app**** on their website 23 November and 09 December. I received another threatening sms 18 December saying I have continued to ignore all forms of correspondence. I refuse to phone because then I don't have record of the conversation and as is their service is not trustworthy.