SUSPENDED LINE FOR WRONG REASONS

I have a contract with MTN for years but resently I've been experiencing problems. On the 30th of November 2019 they deducted an amount of R559 and again on the 3rd of December they deducted another R559,I've noticed that then I reversed the one on the 3rd of December since it was now a double deduction.i phoned them and told them what they they acknowledge that. On the 2nd of January 2020 they deducted an amount of R1129.50 of which it was again a double deduction I phoned them and sent them countless emails as prove,then I reversed it again on the 09 January and informed them. To please deduct the correct amount of R559 they did on 14th of January 2020.they Rededucted again on 03 February an amount of R1129.50 and again I phoned them and I reversed it..I then requested that they deduct the correct amount on the 10th of February they deducted the correct amount..My problem now is they have suspended my line..I can't make phone calls nor receive any they telling me they upgrading their system which will take 2 to 24 hours it's now more than 72 hours still my line is suspended please help me because I'm using my cellphone for business.