Ask for a refund, as they've not delivered the goods they said they would (although check for fine print about what they actually offered and caveats about timescales).
But a refund isn't what most fans want - they want what they bought into, namely a prominent and lasting memento / memorial. Ideally somewhere they can visit, and show friends who come to the stadium. Somewhere 'pleasant and purposeful' - not 'wherever it be shoved'.
The RIGHT gesture here, if I were representing City.... would be to refund everybody who bought into it, and offer it them for free. City have botched this, City should put it right. For me, that's the right things to do, and the best way to salvage the mess.