Failure to load my monthly data bundle

My data bundle is uploaded monthly on the 20th of each month. By the 22 June my data was zero and the monthly bundle due on 20th of June had still not been loaded. I checked again a few minutes ago and still not loaded. Their call centre is non existent and my emails to them are being read and ignored. I have a contract with them in place and they just ignore their part of the contract. The only way I am going to resolve this is by reversing my debit order and hopefully they will then allocate my data bundle. Useless organisation to deal with and definitely moving to another operator on expiry of contract. No doubt they will raise an invoice for full data usage!!!.MTN needs to resolve my query and their inefficiency urgently.