I had twice bad experiences with Sendle.
Once they came to collect the parcel at 7:00am when is 1 hour earlier than the timeframe. The courier didn't press the door bell inform me of their arrival. That made my parcel delay.
Last Friday they scheduled to pick up my parcel from 8:00 am - 6:00 pm. I started to chase up the collection from 1:00 pm and sent about 20 emails. Eventually they told me they had re-schedule to next business day, when next Monday 14 Dec 2020. Today I started to chase my collection at around 8:00 am. There is no any attempt of collection. Terrible.