No statements or invoices

I have not received my January 2015 invoices or statement. Calling the call centre is a nightmare with calls being cut after 3 minutes. Tried to register online but you need a OTP sent to your cell which never arrives so I cannot register. Requested my statement and invoices this morning but can you please tell me how long it is supposed to take to arrive? Hours, days, weeks. My bill must be paid next week but you are making it impossible to do this. Will I have to beg every month for the statement and invoices so I can pay? Renewal is soon and at this rate it won't be with MTN - but I know you don't care about this - the lack of service is testament to the fact you don't need your current customers.