Mtn suspended my account

Hi.. I have had a contract with mtn since 2011. Last year September I upgraded. . I am a cash customer and every 24th I pay my account as soon as I get paid.. the past 4 months they suspend my account and say that I didn't pay... I then have to email my prove of payment and they put my phone back on . Yesterday they suspended my account again saying that I'm in arrieers for 3 months.. I got 10 months bank statements and emailed it to them twice costing me R64. .. and still my phone is not active... when my 2 year contract is over I'm cancelling it and going to vodacom. .. I don't like mtn anymore.. useless