Block scam calls from leaving voicemail?

I am getting many calls every day from the same scammer’s phone number.  I blocked the phone number but I still continued to get notifications many times each day that there were voice messages from that phone number.  At that point, I came to the T-Mobile website and followed the procedure of typing #662# into my phone and received a display saying “Scam Block is now turned on” but I still keep getting the voicemails from the same number many times every day.