Do Better Landplus

I have never been so disappointed with the services.I have been a client of Landplus.I have never missed any payments.However I can't be assisted because I am no longer using the telephone number that I app**** with.I can't do the sim swap as well because when I bought the simcard,it was already RICAed.There is no option to update my details.Therefore I can't be assisted. by Landplus. I feel its unfair because they have all my documents and partiulars.And whenever you call them the do security checks.Even though the security checks have been successful.I am not assisted because according to Landplus I have to use the same number for as long as I do business with them.