Disgruntled customer

On 1st March I have taken a MTN contract for an Ipad with I-store. However on 2nd March I returned at 9h00 & cancelled. WI never left the I-store with device as there was some approvals not received from MTN. Confirmation of me not taking the device was submitted to MTN on the 4th March 2025. Since 5th March I have been in contact with MTN (135) speaking to various call agents (no one could assist). I eventually contacted the Ombudsman & managed to get the contract cancelled & received confirmation from Ombusdman MTN that it was cancelled 18th March with the intention of crediting my MTN account with the debit order of R958.97. However retentions/Cancellations did not remove from system hence received Invoice that I owe them R18k. I contacted Ombudsman who advised I need to submit new mail & contacted 135(Various agents could not assist me) from 29th April. I was told by Phumzile that she has escalated & shared ref nr but called 135 again only to be told the matter is escalated & sorry they cant help. On 1st May I was debited with R5112 due to a capped amount or else they have taken the full amount of R18k. *********** staff & highly frustrating as so much inconvenience caused.