Unfair and ********* blacklisting

I have just checked my credit staus and learnt that they had blacklisted me without even speaking to me. This I believe has to do with an internet package I'd taken out in 2020 with a company called Morclick which I cancelled within the 1st month bacause it was not working and were in breach of contract. Nimble failed to get hold of me and resorted in listing me in the credit Bureau.