Enterprise Investment Scheme — Income Tax relief

I submitted an Enterprise Investment Scheme income tax relief form. This was received on March 18 2024 via post. I am still yet to receive my rebate letter to claim my tax relief. I have rang HMRC several times. Firstly, they said I would receive it at the end of June...then July...then August and now September? The latest was that it was in a queue and they could no longer provide any timescale. With this being submitted over 6 months ago, I am now becoming a bit frustrated and worried it may just be 'lost'. Can anyone shed any light as to the delay and to the actual wait time for this form? Cheers

Hi,
We do have a backlog of post, you can telephone 0300 200 3300 to chase this up and have it escalated.
Thank you.