I have already done that, the only app I had recently installed was Blockaded, as freaking private numbers kept calling each minute.
Of course I have checked call history and such before, nothing was made from my phone, my number was cloned and according to the net some malitious soft is making such calls displaying my number.
They cannot take anything from my credit as I am on a 20 euro top up a month, which is utilised in full to allow me free calls and texts monthly.
What I think those scams do is make people answer the call when a "normal" number is calling and they might get charged instead.
Absolutely nightmare and really nothing helps unless I change my number but I'll wait a bit. Today nobody complained my phone rang them so fingers crossed those feckers got caught.
Thank you all for input and help, if you hear any such similar stories and solutions will be nice to hear them
P.S. On my regular phone, I received yesterday phone calls from very official landline numbers.
They rang exactly 15 seconds - you can tell it's a software making the call. I blocked every such number calling but I am afraif I might block someone who genuinely has to call me )