Upgrade declined due to failed internal security checks

Hi there, 

I’ve seen a few threads on this topic, though none seem to give a straight forward answer. 
 

My existing ID mobile contract is eligible for an early upgrade. Yesterday I went to place the order for the upgrade through the Carphone Warehouse site as IDs own upgrade site appears to be down at the moment.  
 

I placed the upgrade order and shortly after I received a text from CPW saying that they needed more info to process the order. I called them up and found that the issue was that my address didn’t match the address on my ID account. After fixing that on my ID account, CPW confirmed my details now matched and proceeded with their “internal security checks”. At this point I was told that those checks had failed, though they couldn’t tell me why. The person I was speaking to spoke to his manager and was told that this happens from time to time and there was a number I could call to straighten it out and prove that I was the account holder. I took the number from them, went to call it and noticed that I’d jotted it down wrong. Called CPW back to get the correct number and a different number employee told me that there was nothing I could do to fix the issue and that I’d need to wait 30 days before trying to place the order again. 
From reading through other threads on this topic, when those 30 days are up and I go to place my order again I’m likely to be in the exact same situation. 
 

Does anyone know if there is a way around this? Another thread mentions that going into CPW with 2 forms of addresses but my nearest one is 30 miles away I don’t fancy that unless I’m sure it’ll be helpful. 
 

Thanks