I would suggest to return the RAM and re-order it, but if you do return the RAM, make sure that you get the money back you paid for it, if this is done in the shop, you could return it and reorder it at the same time.

Dynamic Pricing is an issue we all face, it is not unusual that prices fluctuate quite a lot, I would not think that it is intentional by Digitec, it is unfortunate if you wait for a long time and I hope Digitec can help with this case.