Vodacom owe me over R690 for almost 9 months..

In February this year I saw I had a credit with Vodacom, I left them because their prices are too high. I emailed POP 4 times, phone the accounts dept 6 times who agreed the amount was outstanding and would be paid to me which they still have not done. THEY HAVE BEEN FORWARDED ALL THE INFO THEY NEED, BANK DETAILS , id ETC., WHAT I FIND VERY UNFAIR IS ...WHEN YOU OWE THEM, THEY CUT YOU OFF Is it because they have the monopoly that they do as they please ??? or Are the staff just ***********?????

I am disgusted at their service and I am taking it further all the legal departments for PEOPLE WHO DONT PAY!

Thank you!