Mytrip.com complaint: Only 37% of cost refunded due to cancellation caused by Covid

Complaint Concerning Order Reference L11UQQ
Booking Number RFM70L and RETLMD
Background
On 221119, I booked a return flight Birmingham to Melbourne due to travel 141020 return 111120 through MyTrip. Total cost £1,273.04
The outbound flight was with Emirates, the return with Qatar.
Because of Covid, I contacted MyTrip and changed my ticket to an Open ticket for 2 years with the full expectation that I would be able to travel OctoberNovember 2022.
Timeline
On 231021
• I contacted MyTrip and was told
o I needed to rebook by 211121
o I would need to pay a £30 admin fee to MyTrip to rebook
o For the outbound Emirates flight
o There would be no charge or increase in price
o I may have to pay additional tax
o The date of travel had to be before 211122 – I wanted to travel around 61022 so all seemed well
o For the return Qatar flight however
o The date of travel had to be before 1522 – before the date I would be travelling to Melbourne!!!
o I telephoned Qatar and was told I would be able to travel in November 2022.
o I relayed the above to MyTrip, who asked that I provide authorisation from Qatar concerning the above
11121
• I contacted Qatar to request the authorisation mentioned above but was told this could only be arranged through the travel agent helpline.
• I contacted MyTrip, who agreed to contact Qatar if I paid £19, which I did. MyTrip later informed me that my return flight had to be taken before 211121 – impossible to do as it was illegal for me to enter to Australia. My only course of action was to cancel the flight, for which I was told I would receive a full refund of about £510 minus a MyTrip admin charge of £30. I was also told to contact the booking helpline to rebook the outward flight with Emirates.
21121
• I contacted MyTrip and spoke to Fareed. I was told
o Emirates would charge an extra £210 for a rearranged flight in October 2022 – note above – I was told on 231021 there would be no increased cost to the flight
o MyTrip would charge an additional £30 admin charge to arrange the above – later rescinded
• The Foreign Office advice at this time was that I could not legally enter Australia, thus any booking would not be covered by my travel insurance. My only course of action was to cancel the whole booking, which I did as I was assured a full refund.
• I received an email from MyTrip telling me the refund might be minus taxes.
251121
I received an email from MyTrip telling me that I would receive a refund of £473.07 – 37% of the original cost.
Complaints
• Why have I been charged £49 extra for MyTrip to do their job as it is not by choice that I have made any changes?
• How can Qatar justify the requirement for me to fly back from a country I cannot legally enter?
• How can Emirates charge £210 extra – they were contracted to provide a flight, not an amount of money?
• How can taxes be deducted that have not been paid? With very few exceptions, it is not possible to enter Australia so almost all the flights will not have taken place.
• I would like a detailed breakdown of how the £473.07 is calculated. I expect a full refund of £1,273.04