Been spamming me since yesterday
Not sure what it was about but it's sure as hell annoying
+49 1515 1709731
You can block the phonenumber.
If they call you on your cell phone you can block them using the Truecaller app or you can follow these tutorials:
iOS:Block phone numbers, contacts, and emails on your iPhone or iPad - Apple Support
Android:Block or unblock a phone number - Phone app Help