Musescore.com review: Unauthorised cancellation of subscription

I am a long-time subscriber to MuseScore Pro. I was concerned that I had unintentionally clicked on a button on their site that might cause me to incur fees for a second subscription, so I sent them a message asking them to cancel any such second subscription because I already have one. Their answer was that they had cancelled my subscription (ie my existing one; I can only assume that I had not actually made the feared mistake). I have sent emails to them asking that they reverse that and reinstate my original subscription (which has price-protection benefits as a long-term continuous user - if I simply resubscribe I will have to pay higher fees). I cannot get a sensible answer to anything.