Bad service

I received a call from consultant and he offered my a different product to what was delivered,so I didn't even open the package phoned them and explained I want the boxed picked up and cancel contract as I was well within my cool off period. This happened Tuesday, Thursday morning a debit order goes off my account luckily I had money in the specific account however if they had cancelled everything as I asked I would not have had to call again request cancellation again and now I have a reversal on my account and I'm in the process of buying a house. I am very unhappy as someone's incompetence messed up my credit record that I've been working very hard on...

Oh and mind you the phone is still not collected. Wow