unauthorised transactions

Kindly assist , I recently discovered that my account was in use for unauthorised transactions for the period between Oct 2022 to March 2023 , I noticed small transactions on a daily basis for uber eats, uber ride, UBER SA help.uber.com etc on my credit card irrespective of the fact that I had removed /deactivated my card from my uber account sometime mid 2022. I raised the query with Uber at the beginning of April 2023 over the phone and they advised me to reply to their email which I did, since then I have not heard from them . I have been struggling to get hold of them, I have tried on email and seems my case is closed on their side as i get the following email response 'we’re unable to respond to conversations that have been closed. Please note that your message has not been received by our support team'. Calling Uber is a challenge as the auto call refers you to use the application 'user help' menu which is unhelpful. These unauthorised transactions add up to +R11K , and it seems there is no interest from Uber to respond to my query.