I don't think it's unreasonable to want a new car that works as it should. When recurring problems like this present it's a royal PITA since they probably are doing the right thing each time in trying to track down the issue (which is probably plugging in the computer and replacing the bit it says it broken). I'm interested that they went cluster rather than sender given I would think the sender would be most likely (and cheaper to replace), but then I have to assume the computer is telling them something else.
The big issue here is the time it takes to return the thing time and time again. Given the circumstances I would be asking for assurances that if/when the problem comes back they will cover 100% of the costs of getting the car to/from the dealership as well as providing a replacement car (or hire car) in a manner that makes it easy for you. The hard part in this is when dealerships open/close vs when you need your car. This could include an agreement from them that 100% of hire car costs will be covered when they are not able to supply a loan vehicle within a reasonable time.
From what you have said it drives as normally (just without a fuel guage) so you should be able to estimate to a reasonable degree when you need to fill up (even if you have to stick to filling up when you think it's about 1/2 a tank) which means you can be a little bit flexible in working out a time to drop it into the dealer.
What I would also be asking is "what is too much"? How many times does the same fault have to occur before VW will replace the vehicle? Let them try to draw that line in the sand.
If you haven't already I would make sure you do as much as possible in writing and keep notes inclduing date, time and person you were speaking to for the other times. Where possible I like to follow up spoken conversations with an email confirming the agreed position and what was discussed. Again, it's a huge pain, but it can help you out later rather than relying on everyones memory of events.
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