Extended warranty not applied

Since my install back in March, I've been chasing my extended inverter warranty as I paid the installer for an extra 5 years.

The story so far was a massive backlog at the wholesaler, and it'd just take some time to filter over to GivEnergy.

Their latest response is that whoever they're buying from is now refusing to apply the warranty because it's gone past some sort of cutoff.

My installer assures me "I have a warranty because it's on the invoice", but clearly that's not going to be the case from GivEnergy's point of view.

I've seen a few other posts on a similar theme. Anyone got any tips for resolving this? Can someone at GivEnergy kick things along from that end?

Thanks.

'Technically' the warranty extension is supposed to be applied within 60 days of comission date.
This is from Midsummer Wholesale

Warranty Extensions for GivEnergy must be processed within 60 days of commissioning the system.
We recommend purchasing it from ourselves within 55 days to allow administrative processing time at Midsummer and at GivEnergy.

If you have either a combined invoice for the entire system + warranty extension OR an invoice for the warranty extension then this is your evidence.

It's then upto your Installer to get onto their Wholesaler to get onto GivEnergy to apply this.

You can check if it has been applied under your My Inverter settings.

I've read about the 60 day cutoff, however the story the entire time has been that my installer has paid their supplier (can't confirm whether that's Midsummer or another distributor), and yet GivEnergy claim nothing has arrived at their end.

Technically I could go after my installer for breach of contract, but that sounds tricky until something actually breaks and there's a figure that can be put on the cost of a repair.

I've asked my installer to provide evidence that they paid for the warranty on time, but while I'm unable to pin the blame, this makes it hard for me to recommend my installer or GivEnergy. I'm hoping some common sense can be applied somewhere in the chain to get this sorted.