Ignorance from Absa

I was given a 50% discount on my ABSA credit card by Attorneys at Absa, and the discount was valid until 30.04.2020. I paid that 50% on the 25th of April and I have been waiting for my paid up letter ever since. I have sent them emails where I attached some of the sms’s and emails I have been receiving from Absa. I need my paid up letter, Absa is not responding to my emails and I don't know what to do anymore and it's really frustrating. I've spent a lot of airtime calling Absa and still not getting answers, which makes me question the competency of the staff. Absa you're pushing me, respond to my emails.