Calls every day about 8pm

Been calling me for weeks now, and I got to them for about 5seconds, heard some foreign person sayUgh something then it hangs up, the thing is i haven't given my number to anyone, since I got it except my partner.
The number appears a private, they forgot to put a on private a few times that's how I now the number, but after I called back they realised I had the number.

I have received approximately 50 missed calls from them over the past 2 months! f*ck off!!

calls persistently, almost twice every day. but hangs up when I pick up the call. NUISANCE CALLER. AVOID or BLOCK

i called back number (02) 8279 8628 rang 5 times then goes to busy tone.

Hangs up soon as i answer always calls 7-8pm tried calling back rings once and then drops out. Pretty its a Bot calling.