May not work
This is unlikely to work as dodgy telemarketers will use number masking techniques when they call. In the UK, there is a code that we can use to determine who has just called. Invariably, when used after one of these marketing calls it will read "the callers number is not available/has been withheld". Without knowing the number, it is impossible to set a specific block. It may be possible as here in the UK to block ALL calls from withheld numbers, but this could also filter out calls you really want.
Any reputable casino will honour a request specifically not to call, however if you never intend to answer, give a number you don't use such as an old mobile one, or a second line.
This goes far wider than unwanted calls from casinos, and telecom companies are being pressurised to release tools so that customers can protect themselves from such intrusions.
Empty Fruities Astern Capt'n
Back to port for unloading.
Full Sails - before we get raided ourselves.
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