Experian SA failing to resolve account challenges.

Not only did they give away our data *******ly, they are also very useless in resolving issues. On 22 July 2020 I sent submitted my challenge of a duplicate account. Someone finally contacted me on 19 August to ask for proof that I only had one account. To date I am still waiting to have the issue resolved. In the meantime, I cannot access credit as the duplicate account makes it such that I am too indebted, which is not the case. What do we do when Experian is messing up our lives like this?????