Irritating Calls

I am not a client of Liquid Telecom but I have, for the last month, been getting about 3-4 calls from them a day. I am assuming telesales. When you call them back on the number, it says number does not exist. Truecaller says there are 531 spam reports on the number already. I feel if you have my number and after two attempts you do not get hold of me, discard my number. I will never be a client of this company for the mere fact of the irritation level they have caused.