Mandatory Reconsideration form sent special delive

Hi there just wondering if anyone knows the rough timescales i should expect to at least receive a text to say that thy had received my Mandatory Reconsideration form. I have sent it Special Delivery and it was signed for on Monday. Nothing yet

It does say on the front of the form that "We will send you a text message or letter to tell you we have received your form"

The phone lines are horrendous so dont want to have to be on hold for hours if i am jumping the gun.

Thanks

Hi there, i did call and got through after 30 mins, the advisor confirmed that they had received the form . However he also claimed they dont send the text, i pointed out it says it on the form. He then suggested that my home number was he primary number, again i stated i had text messages from the original PIP claim and he suggested the system had changed it itself. Now what a lot of codswollop. This type of thing really angers me as my claim is purely based on pain, i do not have any cognitive issues or require anyones help to deal with tasks but it just shows how vulnerable people are - the system changed it itself. Better be on the lookout for terminator next!