Not received full funds as a seller

[vfoteva84]

I sold an item through simple delivery for £7.50 yet I only revived barely half the amount even though there was no fees other than the protection fee of 62p, I did not use advertising either and I don’t know how to raise this issue to get my money 

[tobiasd4]

https://www.ebay.co.uk/itm/366018835259

If it was this item, you listed as freepost, this means you use money from sale to buy postage.