Number has called me 18 times this week when I said stop calling me I was then threatened with them calling me every day at all hours for the next 6 months

6 phone calls in 24 hours. Different lines from same premises so can’t block them. I answered one call. Woman very rude, wouldn’t say her name or why she was calling but kept asking if I was busy and then said I’ll call you back and hung up. Have just received another the following day

I told her not to call my number again.
She rang back immediately leaving a voice mail saying she will call my number every single day.
Couldn’t understand where she said she was from but took for 10 seconds to answer me

Called and after answering didn't respond. Hung up after 10 seconds