Service never installed yet continue to bill us

In October/November 2016 we bought a house and app**** to get our telkom account moved from where we were renting. So first off they cut our line too soon which I accepted thinking it meant they would install our new line pretty quick, took over two weeks, only to be told they had to hand over to a different department due to there being a fault underground and we were told no more than two weeks. This person never showed. Both my husband and I complained numerous times until he eventually told them to cancel. We then moved to the UK in April and we are still getting invoices!!!

I have continually messaged them over facebook complaining so the history is all there and now they are just not responding

Now the only response I have gotten is that the account was last paid in Jan 2017 and we cancelled in Feb. Why were we being charged when YOU did not install our line????