Nashua's pathetic service

Nashua mobile was my service provider but it was liquidated. I was then moved to MTN automatically. The amount of R507.70 was paid to Nashua on the 26th of December. The amount paid was supposed to be paid to MTN instead of Nashua. I alerted Nashua to transfer the amount paid to MTN but no help was given. I have emailed Nashua and copied MTN with the proof of payment many times but still no help. I also drove to Nashua head offices and I spoke to an employee and left him with the proof of payment who said I was not the only one who paid Nashua instead of MTN but many. He told me that the queries are done but get stuck at the financial department. The phone provided by Nashua *** is not at all answered but cuts after notifying the caller that messages are full and therefore no help will be received. My cell phone was suspended twice because Nashua is not willing to transfer this amount to my account or to that of MTN. I must be honest I was not shocked when Nashua closed its business as their service was just pathetic and the proof is what is happening now.