Payments on hold

So this week 2 buyers have reported their items as not received. Payments from yesterday are now on hold until tracking shows the buyers have received them. I post by Royal Mail and don’t track items as most of my items are under the value of £10 and it isn’t cost effective as I offer free postage as well. EBay customer support think tracking costs 10p! Is this going to continue going forward or just this transaction, does anyone know? Thanks