I recently came across a strategy for defeating these infernal calls which cause disturbance to many of us, often several times a day. The calls usually invite you to 'press 5 to talk to an advisor'. The suggestion is to ALWAYS press 5 and, when connected, explain that you just did so to annoy them, just as they have annoyed you on countless occasions.
The strategy may well work. The vermin behind these automated calls really do employ call centre staff to answer everybody who presses 5 and, if sufficient people do so, it should easily overload the call centre to the extent that only a tiny percentage of their time is spent productively. Once the costs exceed the return, they may well abandon the strategy.
I am not qualified to give legal advice and you'd have to judge for yourselves, though I seriously doubt whether any repercussions would be likely.