Chergin me R1800 per month

I engaged in a contract with Vodacom last year for R220.00 per month. Every thing worked fine until 2 months ago when they started charging R1800.00 per month with no prior notification or phone call. Most recently I paid the amount due of R922 on the twenty second of May they came out with an updated bill shortly after that for 1800 but did not tell me about it or let me know of the update amount and this morning they soft locked my phone. I am extremely upset with Vodacom and will never use their services again.<br> <br>