No high level tech support

I've been having an ongoing issues with my inverter dropping off the wifi. They blame my wifi but all my home automation stuff works perfectly. The wifi ****le is only warranted for 2 years, so I say OK i'll pay for a new ****le, but nobody can even supply me with one. The ladies on the helpdesk do their best, but no tech support from anyone beyond them. How do they even continue to operate in South Africa? Be aware. Just buy a Sunsynk or Deye rather.