Not only is the service poor and the website difficult to use, but the cashback was declined for no reason. Met all the terms and conditions, the transaction tracked, but was eventually declined with no explanation and no opportunity for comeback. Impossible to log in to the worldsim website when abroad. SMS topup mechanism does not work. Leaves you with no credit and no way to get more, which sucks when you're in Botswana or wherever. Endless marketing emails from them, it never stops. Why do so many quidco transactions fail to track or get declined.