Call centre drops calls

Yesterday, 14 December 2017, i called Momentum on this number ***. It was between 16h45 and 17h00. I called three times from my number ********** . First call was answered but no one said anything until i dropped the call. Second call was answered by a lady but before we could go far, i was placed on hold with no warning, until i dropped the call. The third time, if im not mistaken, the call was answered then dropped. I was beyond shocked and upset. Does this contact centre even have Quality Accesors? The only time staff is comfortable to pull such ********** stunts is if they know their calls are not monitored. Im so disappointed.