Blinking and beeping red oil light

I would recommend checking your oil level. It is possible that during the oil change the oil pan or oil filter was not secured correctly. In this event, you will have a very slow leak. You may also notice leaking under the car, but that is not the case in every situation. Verify that your oil level is full and that the oil change center or dealership used the correct grade of oil for your vehicle. This happens more times than you would think.

what grade oil did they put in it ?

5W30 SN

I am curious as to where you got the oil changed. check your oil level and see if the plug is tight and filter is tight.

I use vw Passat 2013 model with about 130,000km Suddenly red oil indicator flashes on the panel initially you spark the engine when cold and also little frequent after 30 minutes Have changed both oil pump switch /sensors Please what might be the probable cause

You've all got low oil pressure most likely caused by engine sludge build up. Very common in VW models from 98 on pretty much. VW needs special 5w-40 oil very expensive and some quick change places do not carry.