Vodacom Data signal in Dullstroom

I regret again having to use this media to lodge a complaint but some of us octogenarians do not want to sit on a phone and wait for hours just to do so. Why doesn't Vodacom have an email address through which complaints and/or queries can be submitted ? However, complaint is to do with the atrocious data speeds I have been getting during the last week - indeed, there has frequently been no signal whatever. My subscriptions to Netflix and Britbox are a waste of money if there's no signal. This morning, according to my DSTV decoder, the speed for download was just over 1 mbps. A few moments ago I did a speed test through my laptop. Ping = 379, download speed 3.73 and upload 0.24. Having recently renewed my Vodacom data contract for 100GB monthly - including a new router - I now wonder whether it was worth doing so. this is not the first time I have had to complain about the Vodacom service - to be truthful it is normally REASONABLE but sometimes terrible.