Unhappy long standing customer

The worst network company in this country, I had an issue with an online purchase for a mobile, it was an additional mobile that I ordered on my existing contract, I called customer care and even emailed to have the order canceled and I am still waiting for feedback 3 days later with no response or apology for the delay, I waited 50 minutes on a call to their customer service only to be told that they will get someone to call me back but that never happened to date, I have a contract with them for 11 years now and this has been the first time I experienced such terrible customer service.