If you have recently started doing online marketing for your business then I would urge you to seriously consider before stopping it. Many companies start online marketing and then very quickly stop it or cut it down as they have not seen instant effects. Some forms of online marketing are pretty instant such as Google Adwords or Facebook marketing but others need to be built up over time. If for example you are allowing a web marketer to undertake SEO (search engine optimisation) for you then this may take at least 6 months to start to see any real benefit. Stopping the service after only a few months will not only mean you have wasted the money you have already spent but will quickly case your site to slip back down any ranking positions it has started to gain.
Always analyse your web marketing and move your budget around accordingly but make sure that you give each avenue the time needed to show the benefits.