Beste antwoord door David
I have just checked this for you, but I've noticed your subscription has been transferred to a business plan. After the change of the subscription, from residential to business, your My T-Mobile also changes, since you get a new customer ID. This results in the fact that you can't check your old invoices. From this point on you'll only be able to see your personal details of usage, since it's on a business plan.
If you have any other questions, let us know!