Looking at your account it appears to be a speed problem, to be honest as the profile is dropping due to something either along the line from your house to the exchange or something to do with your internal wiring then switching ISPs is very unlikely to fix this.
You need to ensure that you are using the master socket with a new filter. Remove any extension leads and ensure that nothing could be causing interference in your premises. You may find helpful in explaining MAX dsl.
You need to go through the help assistant and follow the path for customer service > account management and there is an option to request your MAC.
If this post resolved your issue please click the 'This fixed my problem' button