Disgusted with claims decision

I'm having an issue for the first time. Lost our dstv explora 2a model due to weather. Got an accredited installer to come check our damage. We have 2 explora decoders connected via xtraview as well as RF out to two bedrooms that can change channels. Seeing as they don't make the 2a models anymore we had to make the decision with the installer to upgrade the 2a to a 3b or ultra model. I opted to pay in extra and take the ultra,seeing as we have to upgrade now anyway. All new decoders don't have a rf out ports a modulator would be needed to fit into our current installation to change the channel from the bedroom. We agreed that that is what needed to happen. We paid the installer directly as advised and claimed back from OMI.

OMI is only settling the labour,travelling and R500 less on the 3b decoder as quoted on the dstv website. Keeping in mind we live on a farm in the freestate with only one installer in town so we have to go with what they quote for the decoder. Which is the same as on the dstv site.

The will not pay the modulator as the 2a model didn't use a modulator. It didn't because it had RF ports!!!! We had to install one for the current installation to work!! Without it we cannot change the channel as we did before.

Their excuse is their local supplier said it wasn't necessary. Yes, if my installation was only one decoder in one room. Bearing in mind your local supplier doesn't even know what our previous installation looked like. And we received no call to even confirm. just a settlement we just have to accept for less than half of the amount claimed. Aren't we suppose to be insured for replacement values!

Worst service ever.