Data coverage lost - from here to zero in no time

I live on a farm in the Southern Cape and have a Vodacom installed cell network extender. We have enjoyed wonderful service and really good data coverage (HSDPA quality). Making whatsapp calls and streaming live videos were no problem. Around 26 November 2017 all changed overnight - now we still have voice, but struggle to send a whatsapp with simple text included - I have no access to the internet at the moment and need to drive to town to do banking electronically, etc. I have reported this and managed to speak to one technician in the western cape and another called me from George - both acknowledged that either their indoor unit is faulty or needs to be upgraded due to base station upgrades that were done in the area. The problem is that neither are reverting back or doing anything to fix the problem I have also logged a query at the Vodacom call centre - fault ref 1- ********** ********** . I have been a Vodacom customer for more than 20 years and have always had a very good experience - we have a 40GB data contract and a basic voice contract. I am appalled by the absolute absence of any service and support - fixing my problem should be very simple, if I can just get someone to attend to it. We really need our data service - if there's anyone out there that can assist, we will really appreciate it.