reasonable amount of time to wait...

I registered for self assessment using the online registration method so as to claim some relief on money paid into a SIPP. This was back at the beginning of June so I think sufficient time has passed, yet I have not heard back nor are there any submitted forms or messages showing in my online HMRC account. What's the best course of action here? Re-submit or go through the lengthy process of trying to speak to someone - it does seem to be very difficult to get through at the moment. Thanks.

Hi,
You can find out when you can expect to receive a reply form HMRC here: Check when you can expect a reply from HMRC
Thank you.

Thanks, but it was that page that prompted my original question. It's been well past the reasonable amount of time to expect a response. Is it worth attempting to chase the original application or shall I resubmit?