Bad service

Good morning so I joined legalwise on the 1st of April,but on Tuesday the 30th November I received an SMS from them saying that my membership has lapsed,I was shocked,I could not understand,so yesterday the 1st December I phoned,I ask this lady who answered the phone on their side could she please look into my account and tell me what's happening,right she checked for me,after a while she told me I need to rejoin again,I asked her why would I want to do that, because that means I have wait another 3 months again before using their services,I also told her that just before 15 October I notified them to contact me because I want to change my banking details,they said yes they would contact me witch they never did so now she say yes she can see on the system that I did request a change of Banking details,but now why is it my problem if they never phoned me to change my banking details if they did get the request,up until now they never phoned,if I didn't phone yesterday I would of never knew,I will not start over again for their mistake,they need to fix this mess as soon as possible