Secretly increasing handling fees and randomly charging inventory fees

On March 26 and March 27, the inventory fee for EUR/JPY was 15.97/-134.53, and the inventory fee for that day was 8.08/-21.95, which is several times that of other platforms. As soon as I found out, I called the platform to give feedback and apply for a claim. The inventory fee was changed to 1.26/-9.44 the next day. Tuesday and Wednesday were 14 times higher than Thursday. I received an email from them denying the claim, claiming that the fees were not charged by their platform but by the mobile provider. Customers have the obligation and responsibility to understand their various charges. In the past few months, the handling fee was $0.40 per lot. One day in March, I found that the handling fee had increased to $0.56. The platform said that it had notified all customers by email in advance that the platform would increase the handling fee, but I searched through my mailbox and could not find the so-called notification email. Moreover, the platform cannot produce its so-called notification email to all customers. All descriptions and negotiation processes are well documented!