Tap dont waste your time and money. If the course was very cheap then it might be worthwhile, but frankly these things carry no weight and will be very light on useable content. If you want to get some structure to your current skills/experience then consider perhaps a project management certification - which itself is something you wont use much (if at all) in its raw form, but alot of MCs use these certs to give clients assurance, and to provide some useful toold and frameworks for them to work within.
Depending on whether you are working within a specific or niche area, you should also consider relevant certifications from professional bodies - but they require some investment (financially and time) - if a course is easy to get onto, cheap or very short you should be asking yourself why, and where is the benefit (be sure clients would be asking themselves whether that diploma you have is actually meaningful).
Hope this helps