No response from dispute team

I made a booking with Skywise Airline last September for flights over Christmas and as every body knows they have been grounded and have requested clients claim from their bank to get a refund. I paid with my PLATINUM credit card so I thought that should be an easy enough as the services weren't rendered by the merchant. <br> <br> Last week Tuesday I emailed my dispute form, confirmation of my booking with Skywise, proof that they never flew on those days and confirmation of the new flights I had to book because of this whole ordeal. To date I haven't even received an acknowledgement email from yourselves. I called after 24hrs of sending the email and they confirmed they had received it, they were surprised I didn't receive an acknowledgement either but assured me someone will contact me soon regarding it. Still no contact.<br> <br> I need this refund sorted out immediately, please contact me urgently to explain the next steps and time frame. <br> <br> I am sure you understand the frustration we have been faced with already, we don't need additional grief on top of it.<br> Thank you