Solis 12KW vs Deye 12KW,I compared the parameters of both, and there are almost no differences in the important ones. The only difference is that Solis has a higher charging and discharging current than Deye. I believe both are good options and excellent brands.
I’d suggest getting in touch with after-sales support—they might be able to help fix the issue. Or, you could look into getting another Axpert inverter, which works with your current batteries, or a Solis inverter, which is compatible with most batteries out there. This could be a cost-effective way to sort things out.