RCS not updating ITC

On 23 Aug 2021 email was sent to RCS requesting them to update ITC as account not in my name but reflects on ITC. On 2 September 2021 again I email them with request and received Ref nr ACT-***-F6X9G3 on 4 September 2021. On 27 September 2021 again I email them as it still reflected on my ITC. Today, 22 October 2021, nothing has been done and still on ITC. This account which is not in my name, has an effect on my affordability and credit score.