Mr Price Mobile

I am a new account holder with Mr Price, took up a SIM card contract with them, it's the eirsrd decision I've ever took, they do as the please on my account and they refuse to cancel this dim card contract, their agents are rude and difficult on the phone and they refuse to cancel the contract, they're sending me from pillar to post, been send emails but still they don't cancel the SIM card, I am so disappointed with Mr Price, if they don't do something about my complaint I am going to close my account so that I can be in peace and they will lose me as the customer.