Failure to Reimburse in 2021

On 16 June 2021 we paid for flights to East London on my credit card. The flights were cancelled when BA dropped their routes - which means Travelstart had not transferred funds to BA. We emailed for our reimbur*****t, but were told in email correspondence on 3 August that it would take 12-18 weeks (which in itself is absolutely ridiculous). Of course Travelstart now insists you use WhatsApp to communicate, with few responses being received to email. We followed up on 13 August to be sure, on 14 August, 26 August, 10 January 2022, 29 Jan, and 25 FEBRUARY. I have STILL not received back my R4527. Seeing as they make direct communication almost impossible, and it's then end of March 2022, is my only recourse now under the CPA? How can it be so difficult to get direct assistance?