Phone consistently locked every month

After having a contract with vodacom for a year and having been a client of their's since 1998 I have had my phone locked due to a mandatory call limit meant only to be imposed for the first 7 months (ie ending in January 2015) I have been using my phone A LOT for data but have paid the ludicrously expensive data rates without fail within days of generating them. <br> <br> However EVERY month for the last 4 months my phone has been locked due to reaching this mandatory limit, which I can not increase, which Vodacom apparently does not have the ability to unlock until the end of the month. In addition their response has been absolutely appalling. A few months ago I spoke to a customer care representative EVERY DAY for 2 weeks but they were unable to help me. Last month I spoke to a customer care representative 3 days in a row and was told I would receive a call back from a service technician but never did. <br> <br> Every month the only time the phone has been unlocked has been when the end of month is reached so either Vodacom are *********** in their technical ability or have no interest in service. I have had my phone locked at least 25% of the time in the 5 months and am completely fed up.