Another service complaint

<p>I upgraded my cellphone about 2 months ago (online) and was billed double my contracted amount last month? Besides the fact that it i havent received a bill in as many months, it is impossible to update my contact details and I am still awaiting a follow up call form your call centre after 2 weeks of waiting. Help me to understand what I am paying for as, according to your website, I am not supposed to be paying to upgrade a contract online. PS: did not receive a new sim card for my upgrades in February or August 2016.</p>