Nashua Mobile customer records count for nought

I have been a Nashua Mobile customer for more than 18 years. Have had at least two contracts running over this period. Not a single account query over this time. I wanted to add a new data contract to my account. Was told I needed three months bank statements, etc. I was told that as far as Vodacom was concerned I had a two month track record. I couldn't be bothered! Of course it means I'm much more likely to shop around when my current contracts are up for renewal.