Had a similar problem at the start of the year, the scam calls were constant.
Reported the problem to our service provider, who were very concerned..
We were issued with a code, enabling us to block scammers, but every time we blocked, they would ring again using a different number, situation got so bad, the service provider advised us to change our landline number..seemed to be the only option!
Changing numbers was a last resort (such an inconvenience) had to ring around, informing people of number change, but still preferable to being harassed by unscrupulous scammers!
Would always advise, report all scamming!!