Soft locking my account AGAIN

Today, is propably the 7th time within the last 2 months that my account has been softlocked, everytime I phoned in and they promise that it won't happen again. My account is paid each month via debit order. Last month I paid my account early on the 27th of July, just to get it unlocked, and yet here we sit again.<br> I phoned in to customer care this morning after receiving the sms that my account is soft locked, and the person I spoke to just said that it is due to me reaching my credit limit on my account, because of all the calls I made last month. HOW ON EARTH CAN THEY LOCK MY ACCOUNT IF I PAY IT EACH MONTH??? (and this is after I contacted them last month to increase my credit limit, which I haven`t heard anything back in the last 16 days) If this is the case then I will only pay half of my contract fees for August, as I only got to use it for half of the month. I use my phone for work, so of course it is going to have a high call usage. I want my account unlocked immediately!!