Card dispute lack of customer service and urgency

I have logged 3 dispute amounts on my fnb Cheque account I even canceled the card from yhe 27th june up until now I hot no feed back from fnb I have been sending emails I have been messing on the app all I get it's getting investigated we will escalate till now it's getting investigated with no answers 48 hours is all nonsense there is no sense of urgency and lacks customer service.