Contacted 5 times to update details but not done

First I tried emailing a request to update my banking details, this was on the 11th of April. I have yet to receive a reply to this.<br> On the 21st of ApriI I called the call centre who instructed me to send an email with the new details which I did on the same day (ticket # EB52C***6).<br> I called on the 24th April to see if the details had been updated but they hadn't, the lady said it could take 3 weeks and I must call back after the 1st of the month to check again.<br> I called again on the 4th and was told by the lady that she would look into it and call me back which never happened.<br> I was not billed this month so this obviously hasn't been done yet.<br> How much trouble must I go through so that YOU can get YOUR money?<br> I expect to be contacted today and have this sorted out otherwise I will be moving my services elsewhere.