Blocked account again, and no itemised billing

Every last day of every month since my account moved from Nashua Mobile, my account is suspended due to \your monthly usage limit of R0.00 has been exceeded". Every month I phone the call centre and they assure me it's been rectified and that there is no limit on the \""high usage\"". Ha Ha. Every month end the same thing again. No resolution!! And I've asked for the itemised billing that I've been paying for but nothing forthcoming. What a joke!"""