Can i cancel my contract after 4 days?

Hi just joined few days ago and found a better deal with lebara. Can i cancel current contract and rejoin the new deal as a new customer?

If you ported in number you will need to leave first.
If you just want new contract without number can just sign up for new one

I would have thought, to make things easier, Lebara would be able to modify the contract, to match the better offer.
If this cannot be done, then yes, you have 14 days to cancel.