17 year loyal Vodacom Client No More

My Current Vodacom Number has being in our family for close to 20 years of Which in my personal use for about 17.<br> <br> I took out a 10GB Top up Data plan with Vodacom in Jan for R499 a month for 24 Months, If the data has reach the limit the only way i can access more is to Top up. However as i couldn't find my monthly statement in my email I went to my local Vodacom Branch and to my Shock saw that i will be Billed at R5718.25 This Month as Vodacom never Toped up my Data Plan for Feb or March but Continued to Bill me on Out of Bundle Rates Since Jan. I have phoned your accounts Number as provided by my local Branch but after Spending 50min on the line Decided more desperate measures should be called for. Please rectify this ASAP!!!