No compensation received after Vueling overbooked our flight

Good day can someone from Vueling please contact me. I am trying to get feedback on the compensation due to me as a result of Vueling overbooking the flight for the past months. I am. Also unable to speak to a consultant after the changes made to the options on the telephone line so can't follow up on my reference number. I have beem waiting since January just to get a statement from the Finance department indicating proof of so called payment made to me which I was never informed about, notified nor have a received this payment. My sister on the other hand did receive payment within 3 days so I know that the promised made by Vueling are true. However in my case my reference number has been open for 6 months now and no response from Vueling. Everytime I called (when there was still the option to speak with a consultant - last call 28. 92.2018) I was told that my case has been escalated to the Finance department and that if the e-mail is not received I should call again in 48 hours. This has been going on since February. So if Vueling can either please send me the link in order to update my banking details for payment / or send me proof of this so called compensation paid as well as a statement indicating payment to me so that I can then follow up with my bank should that be the case. That would be appreciated. My case number: 1- ********** 4867 Thanks