Poor Service SADV

I have been struggling more than 2 months to get SADV to change details on my accounts that I have with them. It's by far the most ridiculous experience have had with an ISP. I've e-mailed on various occasions where they will either not respond or not complete the changes I requested. I've phoned the accounts department numerous times and will be on the phone for half an hour at a time with no answer. When I ask the reception what is going on they just tell me they don't know where the account department staff are. I've never seen such a poorly run company that is miss managed on such a scale. I would never recommend them to anyone.