Vodacom dont value their clients

I have more than 10 yrs contract with vodacom. My account conducted excellent all this years. Last month I missed just 1 payment and bcos am a loyal client I phoned them to make arrangement to pay immediately but I was told I don't have to they will double bill me in November which they did. Last week I then app**** for another contract to buy 2 vodacom tablet for R140 but I was told my application was unsuccessful due to non payment. I am very disappointed with the way vodacom value me as a client. Credit department could have seen dat my account over the years was conducted in an excellent manner. How is dat missing just 1 payment be reason for a declined. Me and my husband have decided that if we don't get assist from you at the end of our contract we will move our numbers to other service provider. Ref no. DDPC6M.