Blocking their number and email but still get messages

You will undoubtedly have already read the Apple articles below.

Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch

Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch - Apple Support

Detect and block spam phone calls

Detect and block spam phone calls - Apple Support

Blocking their number and email but still get messages

Recognize and avoid phishing messages, phony support calls, and other scams

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

• If you receive a suspicious email or SMS text message that looks like it's supposed to be from Apple, please email it to reportphishing@apple.com
• To report illegal, obnoxious, unwanted or malicious e-mail from an Outlook.com, Hotmail, Live or MSN account, please forward the unwanted message in its entirety (including the entire message header), to abuse@outlook.com
• To report illegal, obnoxious, unwanted or malicious e-mail from Gmail -> https://support.google.com/a/answer/178266?hl=en

Contact / visit your carrier & ask them to block that 'spam' phone numbers.