Mweb increases billing without customer consent.

M-Web continuously increase their monthly premium after supposedly upgrading the client's internet speeds without any consultation with their clients. We end paying more but I don't see the increase in speed. When trying to query it with the billing department the IVR goes through a whole process only to terminate the call at the end with an apology that they are not contactable at the moment. This is borderline ***** and I would like someone to come back to me urgently. Failing this I will be cancelling the service after being a client for over 2 decades.