Frustrated by RCS group

On the 3rd of November 2023 I opened a makro credit card and on the 6th of November 2023 a *****ulent simswap was done and a *****ulent purchase was made in stores that i have never been to, my credit was maxed out. I only realized when I received my statement and contacted the them to report, I sent all the relevant documents to RCS ***** on 20 November 2023 and an email was sent stating that I will be contacted as soon as an investigation has begun. I have not heard from the since, which makes me wonder if there is any investigation currently going on, I'm unable to get hold of them via their landline and they never respond to emails. Instead I got a call that my account has been handed over and there is no evidence of any investigation on the debt collectors side. I am very disappointed in the RCS group, I'd never advice anyone to take out credit with them