We used ROI for our SEO activities. We cancelled the contract after reviewing the results as compared to the promises.
When we cancelled the contract, ROI required 30 days notice. We were okay with this and requested that the services continue during the notice period. We were happy to pay for services provided and had the expectation that we would get the services we were paying for.
ROI refused to provide any services during the notice period. We informed ROI that we would not pay for services that they refused to provide.
ROI then flagged our non payment with the credit agencies. They were clearly trying to be vindictive.
I would suggest avoiding a company that behaves in this way.