@Iannelli999 I'm really sorry your number has still not been transferred. @DavidM is back in the office this afternoon and I'll let him know you've posted so he can chase this up with the number port team.
I hope you don't mind that I've moved your the post back to this thread as it's best to keep all the posts in the one place as it's easier for the community to follow.
Your problem doesn't seem to be a straight forward 'number port' issue at all, there appears to be more going on than that, normally a number port is when an end user moves between providers and wants to keep 'their' number, but the address doesn't change, your problem appears to be that you have moved into your parents home from somewhere else , and presumably you had a BT Consumer provided line at that address, you wanted to move your account ( but not the number ) to your parents house, they were Talk Talk customers, and presumably had ported the telephone number from BT to TT at some time in the past, and you wanted their number allocated to your account , if this is an accurate then it's not surprising it's went wrong.
Its easy to be wise after the event, but if it's a case of wanting BT to supply service , why not just port the number back from TT to BT in your parents name, them getting a 'new' BT account number in the process, this is what the port process is designed to deliver, one end user, one address, one phone number one losing provider and one gaining provider, if you wanted responsibility for paying the BT bill, arrange payment to come from your bank account, I suppose if you were potentially within a minimum term at your 'old' address , and wanted to avoid ETC's may explain why the convoluted order chain to get your account at your parents address.
If TT have now ceased your parents account and service, irrespective of the status of the number port then the number will eventually revert to the number range holder, and if the number has existed for decades , that must be BT , so BT will get that number back ....it's possible though that there may be a quarantine period for the number, and if that is the case a delay may be inevitable.
If the service at your parents address is now supplied by BT in your name ( with your 'old' account number ) , and you have any old BT number , you should eventually be able to renumber whatever number they gave you, to the number you really want when the wanted number is properly back with BT and free of any restriction/quarantine period.
Obviously , if you were told that what you wanted was simple and would happen without any problem or delay,then your grievances are understandable, but TBH, what you wanted to do is not what the number port process is designed for.