If your bin hasn't been collected after you reported it online, you'll want to follow up using the designated form. Oldham Council states that if the collection hasn't occurred within the advised timeframe, you can complete a form to have the bin collected within the next 48 hours.
Here's what you need to do:
You can find the follow-up form here: Follow up a missed bin already reported.
It's also a good idea to ensure your bin was out by the agreed time and that there’s no contamination preventing collection.