Wireless communication services

I'm trying to get through to T Mobile by the phone number specified in the contract, and they tell me that this number is not serviced. Why give a phone number if it is not discussed?

Go online and on the official website of T Mobile you will find not only phone numbers, but also the email address of the customer support service. But I prefer to contact them in tmobile customer service . This method practically eliminates the loss of time waiting for the company's employees to respond.