Worst on-line service ever

I made an on-line purchase on the 7 May 2020 with an instore collection as the website indicated a 6day collection period. Well, i am still waiting even after calling the on-line store department where Angel/apparently a 'Manager' promised to call me back to provide feedback as my items were 'picked' but was awaiting collection....well it has been 2 weeks and no call. I have emailed several times....guess what...still nothing. On 29 May after a further call to the on-line department, Benjamin assured me my items would be delivered latest by Friday 5th, however i am not holding my breath. Whilst i understand we are in difficult times, this is unacceptable service levels. I didn't give myself timeframes, i got that info on their Website, so if they were underpressure they should have provided more realistic timeframes so that i could have made my purchase decisions with that info in mind.