MFC not responding

On my previous review MFC responded to me with their Service resolution specialist. i have received feedback on 13 April with the wrong resolution to my query. I have responded in a very Polite way stating the problem i have the next day. the specialist responded back that the request was forwarded to the manager. on 17 april i started asking for follow ups and after two follow up emails i have called MFC asking for feedback whereby they said the Same specialist will call me for feedback. i have waited for two days and decided to call the number on the email signature where the line was busy. waited and then saw my number was being blocked as well. then today 2020-04-23 after waiting for 10 Minutes on the line i run out of airtime waiting for assistance. I need some assistance here please i have been patient as i understand the times but now its a problem as i have been waiting since 13 april to have my issue fixed. Kindly assist or is the best option to ask for a Ombudsman assistance?