WORST SERVICE EVER!

I had all my lines blocked last week due to a glitch in the system, the debit order was due to go off on the 1st, which was a Sunday, they shut me down instead of just taking the debit a few days earlier. I then made contact and requested via a letter on letterhead to have my credit limit increased. I received a reference number which I try and call in with but the call centre tells me it doesn't exist. They re-activated some of my lines but not all of them. I have called in countless times and get told a different story every time, either the system shows nothing wrong with my account, or my account is still in arrears, or I must just restart the device. On Monday the 9th I contacted them again as 2 lines are not being reconnected, they tell me to send a letter on a letterhead again, which I do, I call in on Tuesday to find out progress and they tell me it isn't being processed because I sent it on a word document and it needs to be in PDF, I resend the letter in PDF and called yesterday afternoon to be told it is being processed, call this morning to be told it is not processed because I didn't send a copy of the ID book. DISGUSTED!!!! Ready to change providers