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Call out is expensive and an excuse to hike the price. Unplug it and take the lid and/or back off and take a peak. I emphasise re the plug as a former colleague of mine has a spectacular burn scar on his forearm from the electrics of a washing machine. I used to repair old washing machines and vacuum cleaners for a friend's business 30 years ago and it's time consuming and if you replace one thing the rest is still old and worn.
The chances are a weld or rivet has gone causing a wobble in the pulley on the back of the drum or the main bearing has gone. It's probably not worth repairing even if you can get the parts. They do seem to have a finite life nowadays and if something lets go at 1000 rpm+ then other stuff may get damaged too. -
We had an old Hotpoint that did this; turns out it was the bearings. Ours developed enough play that it rubbed against the seals on the spin cycle and started to catch fire. When the tech came out he said that it was still electrically sound and just needed a new bearing, but by that point we'd already replaced it...
Washing Machine (Indesit IWME126) making a clunk sound each time the drum turns past a specific point.
Drive pulley? Bearings?
DIY repairable? Call someone out? Replace it (it's ~7 years old, bottom of the range but in good condition otherwise)?
Annoying as I'd only just treated it by cleaning out random stones and sludge from the pump pre-chamber and this is how it rewards me.