Billing problems again

December 2014 - March 2015 I received bills 3 times my normal usage. I contacted Neotel and asked for the breakdowns had to phone and email the a lot. They could not say why my accounts was so high nothing even tough we were away on holiday and not home. They just didn't care. So I caped my account on x amount and all went well till now. Now once again I receive a bill 3 times my normal usage. This now after my account is capped at x amount. I don't even work from home anymore but my account is extremely high again. You are suppose to receive a notification once you have reatched your cap but nothing, not an account for the last year and no email correspondence till today. Now once again we had to phone about 4 times today and email to obtain the account!!! Still they cannot tell why the bill is so high even tough the account is capped. When I worke from home I reached my cap then I'm cut off, had to phone them to add x amount. Now the excuse is they cannot cut me of if I'm online. So you want to tell me I'm 24h 7days a week online all the time even if there is no one home!! ********. So let's see once again if this useless company is going to contact me to sort this!!!